List of numbers — Integers This is a list of articles about numbers (not about numerals). ...
The integers are commonly denoted by the above symbol. ...
← **1k** 2k 3k 4k 5k 6k 7k 8k 9k → Nine hundred is the natural number following eight hundred ninety-nine and preceding nine hundred one. ...
2000 (two thousand) is the natural number following 1999 and preceding 2001. ...
Three thousand (3000) is the natural number following 2999 and preceding 3001. ...
Four thousand (4000) is the natural number following 3999 and preceding 4001. ...
Five thousand (5000) is the natural number following 4999 and preceding 5001. ...
Six thousand (6000) is the natural number following 5999 and preceding 6001. ...
7000 is the natural number following 6999 and preceding 7001. ...
8000 (eight thousand) is the natural number following 7999 and preceding 8001. ...
9000 (nine thousand) is the natural number following 8999 and preceding 9001. ...
Look up ten thousand in Wiktionary, the free dictionary. ...
| Cardinal | 1000 one thousand | Ordinal | 1000th one thousandth | Factorization | | Divisors | 2, 4, 5, 10, 20, 25, 50 | Roman numeral | M | Roman numeral (Unicode) | M, m | prefixes | Wiktionary:chilia (from Greek) Wiktionary:milli- (from Latin) Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set. ...
Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ...
In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ...
In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ...
The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ...
A numerical prefix is a prefix that denotes a number, which is usually a multiplier for the thing being prefixed. ...
Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ...
| Binary | 1111101000 | Octal | 1750 | Duodecimal | 6B4 | Hexadecimal | 3E8 | Look up **one thousand** in Wiktionary, the free dictionary. **1000** (**one thousand**) is the natural number following 999 and preceding 1001. The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ...
The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. ...
The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ...
In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0â€“9 and Aâ€“F, or aâ€“f. ...
Wikipedia does not have an article with this exact name. ...
Wiktionary (from wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...
In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ...
Nine hundred ninety-nine is the natural number following nine hundred ninety-eight and preceding one thousand. ...
1001 is the natural number preceding 1002 and following 1000. ...
## In mathematics
- The decimal representation for one thousand is
- The SI prefix for a thousand is
**kilo-**, officially abbreviated as **k** — for instance prefixed to *metre* or its abbreviation *m*, *kilometre* or *km* signifies a thousand metres ; - as such technically oriented people occasionally represent the number in a non-standard notation by replacing the last three zeroes of the general numeral with "k", for instance 30 k for 30,000
- The sum of Euler's totient function over the first 57 integers is 1000.
Look up one in Wiktionary, the free dictionary. ...
0 (zero) is both a number and a numerical digit used to represent that number in numerals. ...
Engineering notation is scientific notation in which the powers of ten are limited to those where the exponent is a multiple of three, i. ...
Scientific notation is a (very helpfull) notation for writing numbers that is often used by scientists and mathematicians to make it easier to write large and small numbers. ...
Scientific notation is a (very helpfull) notation for writing numbers that is often used by scientists and mathematicians to make it easier to write large and small numbers. ...
Look up si, Si, SI in Wiktionary, the free dictionary. ...
An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. ...
Kilo (symbol: k) is a prefix in the SI system denoting 103 or 1000. ...
The metre (or meter, see spelling differences) is a measure of length. ...
A number is an abstract entity that represents a count or measurement. ...
A numeral is a symbol or group of symbols that represents a number. ...
The first thousand values of Ï†(n) In number theory, the totient (n) of a positive integer n is defined to be the number of positive integers less than or equal to n and coprime to n. ...
## In time A millennium (pl. ...
Europe in 1000 The year 1000 of the Gregorian Calendar was the last year of the 10th century as well as the last year of the first millennium. ...
Dionysius Exiguus invented Anno Domini years to date Easter. ...
## In popular culture For information on the number 1000, see 1000 (number). ...
1993 (MCMXCIII) was a common year starting on Friday of the Gregorian calendar and marked the Beginning of the International Decade to Combat Racism and Racial Discrimination (1993-2003). ...
Techno is a form of electronic dance music that became prominent in Detroit, Michigan (some argue that it may have been born in Europe) during the mid-1980s with influences from Chicago House, electro, New Wave, Funk and futuristic fiction themes that were prevalent and relative to modern culture during...
Moby (born Richard Melville Hall on September 11, 1965, in Harlem, New York, and raised in Darien, Connecticut) is an American songwriter, musician and singer. ...
Slang is the use of highly informal words and expressions that are not considered standard in the speakers dialect or language. ...
For other uses, see United States (disambiguation) and US (disambiguation). ...
The term gambling has had many different meanings depending on the cultural and historical context in which it is used. ...
Dime is a term with multiple slang meanings. ...
## Trivia To count to one thousand, counting one number every second continuously would take 16 minutes and 40 seconds. Look up second in Wiktionary, the free dictionary. ...
A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ...
Look up second in Wiktionary, the free dictionary. ...
## Selected numbers in the thousands (1001-1999) ### 1001-1249 **1001** - sphenic number (7 x 11 x 13), pentagonal number, pentatope number - 1002 - sphenic number, Mertens function zero, abundant number
- 1003 - semiprime (17 × 59)
- 1005 - Mertens function zero
- 1008 - divisible by the number of primes below it
- 1009 - first prime above 1000
- 1010 - Mertens function zero
- 1013 - Sophie Germain prime, centered square number, Mertens function zero
- 1014 - Mertens function zero
- 1015 - square pyramidal number
- 1016 - member of the Mian-Chowla sequence
- 1018 - Mertens function zero
- 1019 - Sophie Germain prime, safe prime
- 1020 - polydivisible number
- 1023 - is the highest number one can count to on one's fingers using binary
- 1024 - 2
^{10}, the amount of bytes in a kilobyte (in 1999, the IEC coined kibibyte to use for 1024 with kilobyte being 1000, but this convention has not been widely adopted) - 1027 - sum of the squares of the first eight primes
- 1028 - sum of totient function for first 58 integers
- 1031 - Sophie Germain prime
- 1035 - triangular number, hexagonal number
- 1049 - Sophie Germain prime, highly cototient number
- 1051 - centered pentagonal number
- 1056 - pronic number
- 1060 - sum of the first 25 primes
- 1071 - heptagonal number
- 1072 - centered heptagonal number
- 1079 - every positive integer is the sum of at most 1079 tenth powers.
- 1080 - pentagonal number
- 1081 - triangular number, member of Padovan sequence
- 1086 - Smith number, sum of totient function for first 59 integers
- 1087 - Chen prime, cousin prime, lucky prime, Kynea number
- 1089 - 33
^{2}, nonagonal number, centered octagonal number - 1091 - cousin prime and twin prime
- 1092- divisible by the number of primes below it
- 1093 - twin prime and star number
- 1102 - sum of totient function for first 60 integers
- 1103 - Sophie Germain prime, balanced prime
- 1104 - Keith number
- 1105 - Carmichael number, magic constant of
*n* × *n* normal magic square and n-Queens Problem for n = 13, decagonal number, centered square number, 1105 = 33^{2} + 4^{2} = 32^{2} + 9^{2} = 31^{2} + 12^{2} = 23^{2} + 24^{2} - 1116 - divisible by the number of primes below it
- 1122 - pronic number, divisible by the number of primes below it
- 1123 - balanced prime
- 1124 - Leyland number
- 1128 - triangular number, hexagonal number, divisible by the number of primes below it
- 1134- divisible by the number of primes below it
- 1138 - recurring number in the works of George Lucas and his companies, beginning with his first feature film -
*THX 1138*; particularly, a special code for Easter eggs on *Star Wars* DVDs. - 1140 - tetrahedral number
- 1152 - highly totient number
- 1156 - 34
^{2}, octahedral number, centered pentagonal number - 1159 - member of the Mian-Chowla sequence
- 1161 - sum of the first 26 primes
- 1162 - pentagonal number, sum of totient function for first 61 integers
- 1169 - highly cototient number
- 1170 - highest possible score in an NAQT match
- 1176 - triangular number
- 1177 - heptagonal number
- 1184 - amicable number with 1210
- 1187 - safe prime, Stern prime, balanced prime
- 1190 - pronic number
- 1192 - sum of totient function for first 62 integers
- 1198 - centered heptagonal number
- 1200 - the number of households the Nielsen ratings sample
- 1201 - centered square number
- 1210 - amicable number with 1184
- 1216 - nonagonal number
- 1219 - Mertens function zero
- 1220 - Mertens function zero
- 1223 - Sophie Germain prime, balanced prime
- 1225 - 35
^{2}, triangular number, triangular square number, hexagonal number, centered octagonal number - 1228 - sum of totient function for first 63 integers
- 1229 - Sophie Germain prime
- 1233 - 12
^{2} + 33^{2} - 1240 - square pyramidal number
- 1241 - centered cube number
- 1242 - decagonal number
- 1247 - pentagonal number
1001 is the natural number preceding 1002 and following 1000. ...
A sphenic number is a positive integer that is the product of three distinct prime factors. ...
A pentagonal number is a figurate number that represents a pentagon. ...
A pentatope number is a number in the fifth cell of any row of Pascals triangle starting with the 5-term row 1 4 6 4 1 either from left to right or from right to left. ...
In number theory, the Mertens function is where μ(k) is the Möbius function. ...
In mathematics, an abundant number or excessive number is a number n for which Ïƒ(n) > 2n. ...
In mathematics, a semiprime (also called biprime or 2-almost prime, or pq number) is a natural number that is the product of two (not necessarily distinct) prime numbers. ...
In mathematics, a prime number (or a prime) is a positive integer that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. ...
A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ...
A centered square number is a centered figurate number that represents a square with a dot in the center and all other dots surrounding the center up to a certain city block distance, i. ...
A pyramidal number, or square pyramidal number, is a figurate number that represents a pyramid with a base and four sides. ...
In mathematics, the Mian-Chowla sequence is a integer sequence with and recursively, for being the smallest integer such that each pairwise sum is distinct from the others, where and likewise for . ...
A safe prime is a prime number of the form 2p + 1, where p is also a prime. ...
In mathematics a polydivisible number is a number with digits that has the following properties :- Its first digit a is not 0. ...
1024 is the natural number following 1023 and preceding 1025. ...
This article refers to the unit of binary information. ...
A kilobyte (derived from the SI prefix kilo-, meaning 1000) is a unit of information or computer storage equal to the decimal 1024 bytes (2 to the 10th power, or 1,024 bytes based in the binary system). ...
A triangular number is a natural number such that the shape of an equilateral triangle can be formed by that number of points. ...
A hexagonal number is a figurate number that represents a hexagon. ...
In number theory, a branch of mathematics, a highly cototient number k is an integer that has more solutions to the equation x - φ(x) = k, where φ is Eulers totient function, than any integer below it, with the exception of 1. ...
A centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers. ...
A pronic number, or oblong number or heteromecic number, is a number which is the product of two consecutive nonnegative integers, that is, n(n + 1). ...
A heptagonal number is a figurate number that represents a heptagon. ...
A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers. ...
The Padovan sequence is the sequence of integers P(n) defined by the initial values and the recurrence relation The first few values of P(n) are 1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, 16, 21, 28, 37, 49, 65, 86, 144, 151, 200. ...
A Smith number is a number which in a given base, the sum of its digits is equal to the sum of the digits in its factorization. ...
A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes. ...
In mathematics, a cousin prime is a pair of prime numbers that differ by four; compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six. ...
Headline text A lucky prime is a number that is a prime number and a lucky number. ...
A KynÃ©a number (pronounced: Ka-Nay), named after KynÃ©a R. Griffith, is an integer of the form . ...
1089 is the number after 1088 and before 1090. ...
A nonagonal number or enneagonal number is a figurate number that represents a nonagon. ...
A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers. ...
In mathematics, a cousin prime is a pair of prime numbers that differ by four; compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six. ...
A twin prime is a prime number that differs from another prime number by two. ...
A twin prime is a prime number that differs from another prime number by two. ...
A star number, or centered 12-gonal number, is a centered figurate number that represents a centered hexagram, such as the one that Chinese checkers are played on. ...
A balanced prime is a prime number that is equal to the arithmetic mean of the nearest prime above and below. ...
In mathematics, a Keith number or repfigit number is an integer that appears as a term in a linear recurrence relation with initial terms based off its own digits. ...
In number theory, a Carmichael number is a composite positive integer n which satisfies the congruence bn âˆ’ 1 â‰¡ 1 (mod n) for all integers b which are relatively prime to n (see modular arithmetic). ...
The magic constant of a magic square, an n-by-n matrix, is defined such that the sum of any row, column or main diagonal yields the same result, denoted M2(n). ...
It has been suggested that Date magic square be merged into this article or section. ...
One possible solution The eight queens puzzle is the problem of putting eight chess queens on an 8Ã—8 chessboard such that none of them is able to capture any other using the standard chess queens moves. ...
A decagonal number is a figurate number that represents a decagon. ...
A Leyland number is an integer of the form xy + yx with 1 < x â‰¤ y. ...
1138 is the natural number following 1137 and preceding 1139. ...
George Walton Lucas, Jr. ...
THX 1138 was George Lucas first full length movie. ...
Opening logo to the Star Wars films Star Wars is an epic science fantasy saga and fictional universe that was created by writer/producer/director George Lucas during the late 1970s. ...
A pyramid with side length 5 contains 35 spheres. ...
A highly totient number k is an integer that has more solutions to the equation φ(x) = k, where φ is Eulers totient function, than any integer below it. ...
An octahedral number is a figurate number that represents an octahedron, or two pyramids placed together, one upside-down underneath the other. ...
National Academic Quiz Tournaments (LLC) is a question-writing and quizbowl organizing company founded by former players in 1996. ...
Amicable numbers are two numbers so related that the sum of the proper divisors of the one is equal to the other, unity being considered as a proper divisor but not the number itself. ...
A Stern prime is a prime number that is not the sum of a smaller prime and twice the square of a nonzero integer. ...
When TV viewers or entertainment professionals in the United States mention ratings they are often referring to Nielsen Ratings, a system developed by Nielsen Media Research to determine the audience size and composition of television programming. ...
A triangular square number is a number which is both a triangular number and a perfect square. ...
A centered cube number is a centered figurate number that represents a cube. ...
### 1250-1499 - 1255 - Mertens function zero
- 1256 - Mertens function zero
- 1258 - Mertens function zero
- 1259 - highly cototient number
- 1260 - highly composite number, pronic number, vampire number, sum of totient function for first 64 integers
- 1261 - star number, Mertens function zero
- 1264 - sum of the first 27 primes
- 1266 - centered pentagonal number, Mertens function zero
- 1270 - Mertens function zero
- 1279 - Mertens function zero
- 1280 - Mertens function zero
- 1282 - Mertens function zero
- 1283 - safe prime
- 1285 - Mertens function zero
- 1288 - heptagonal number
- 1289 - Sophie Germain prime, Mertens function zero
- 1291 - Mertens function zero
- 1292 - Mertens function zero
- 1296 - 6
^{4}, 36^{2}, sum of the cubes of the first eight positive integers, the number of rectangles on a normal 8x8 chessboard - 1297 - Mertens function zero
- 1299 - Mertens function zero
- 1300 - Mertens function zero, largest possible win margin in an NAQT match
- 1301 - centered square number
- 1302 - Mertens function zero
- 1306 - Mertens function zero
- 1307 - safe prime
- 1312 - member of the Mian-Chowla sequence
- 1308 - sum of totient function for first 65 integers
- 1318 - Mertens function zero
- 1319 - safe prime
- 1325 - Markov number
- 1326 - triangular number, hexagonal number, Mertens function zero
- 1328 - sum of totient function for first 66 integers
- 1329 - Mertens function zero
- 1330 - tetrahedral number, forms a Ruth-Aaron pair with 1331 under second definition
- 1331 - 11
^{3}, centered heptagonal number, forms a Ruth-Aaron pair with 1330 under second definition - 1332 - pronic number
- 1335 - pentagonal number, Mertens function zero
- 1336 - Mertens function zero
- 1337 - Used in the novel form of spelling called leet
- 1338 - Mertens function zero
- 1342 - Mertens function zero
- 1350 - nonagonal number
- 1365 - pentatope number
- 1367 - safe prime, balanced prime
- 1369 - 37
^{2}, centered octagonal number - 1371 - sum of the first 28 primes
- 1378 - triangular number
- 1379 - magic constant of
*n* × *n* normal magic square and n-Queens Problem for n = 14. - 1381 - centered pentagonal number
- 1387 - super-Poulet number, decagonal number
- 1394 - sum of totient function for first 67 integers
- 1395 - vampire number, member of the Mian-Chowla sequence
- 1404 - heptagonal number
- 1405 - 26
^{2} + 27^{2}, , centered square number - 1406 - pronic number, semi-meandric number
- 1409 - Sophie Germain prime
- 1419 - Zeisel number
- 1425 - self-descriptive number in base 5
- 1426 - sum of totient function for first 68 integers
- 1426 - pentagonal number
- 1430 - Catalan number
- 1431 - triangular number, hexagonal number
- 1432 - member of Padovan sequence
- 1435 - vampire number; the standard railway gauge in millimetres, equivalent to 4' 8½"
- 1439 - Sophie Germain prime, safe prime
- 1440 - a highly totient number and a 481-gonal number. Also, the number of minutes in one day, and the blocksize of a standard 3,5" floppy disk
- 1441 - star number
- 1444 - 38
^{2}, smallest pandigital number in Roman numerals - 1451 - Sophie Germain prime
- 1469 - octahedral number, highly cototient number
- 1470 - pentagonal pyramidal number, sum of totient function for first 69 integers
- 1471 - centered heptagonal number
- 1480 - sum of the first 29 primes
- 1481 - Sophie Germain prime
- 1482 - pronic number
- 1485 - triangular number
- 1487 - safe prime
- 1490 - tetranacci number
- 1491 - nonagonal number, Mertens function zero
- 1492 - Mertens function zero
- 1493 - Stern prime
- 1494 - sum of totient function for first 70 integers
- 1496 - square pyramidal number
- 1499 - Sophie Germain prime
A highly composite number is a positive integer which has more divisors than any positive integer below it. ...
A vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains all the digits from x and...
In geometry, a rectangle is a defined as a quadrilateral polygon in which all four angles are right angles. ...
Chessboard Chessboard with Staunton chess pieces A chessboard is often painted or engraved on a chess table. ...
National Academic Quiz Tournaments (LLC) is a question-writing and quizbowl organizing company founded by former players in 1996. ...
A Markov number or Markoff number is an integer x, y or z that is part of a solution to the Markov Diophantine equation The first few Markov numbers are 1, 2, 5, 13, 29, 34, 89, 169, 194, 233, 433, 610, 985, 1325, ... (sequence A002559 in OEIS) appearing in...
A Ruth-Aaron pair consists of two consecutive integers (e. ...
This article does not adequately cite its references or sources. ...
The magic constant of a magic square, an n-by-n matrix, is defined such that the sum of any row, column or main diagonal yields the same result, denoted M2(n). ...
It has been suggested that Date magic square be merged into this article or section. ...
One possible solution The eight queens puzzle is the problem of putting eight chess queens on an 8Ã—8 chessboard such that none of them is able to capture any other using the standard chess queens moves. ...
A super-Poulet number is a Poulet number whose every divisor d divides 2d - 2. ...
A vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains all the digits from x and...
In mathematics, a meander or closed meander is a self-avoiding closed curve which intersects a line a number of times. ...
A Zeisel number is a square-free integer k with at least three prime factors which fall into the pattern where a and b are fixed constants and x is the index number of each prime factor in the factorization, sorted from lowest to highest. ...
A self-descriptive number is an integer m that in a given base b is b-digits long in which each digit d at position n (the most significant digit being at position 0 and the least significant at position b - 1) counts how many instances of digit n are...
In combinatorial mathematics, the Catalan numbers form a sequence of natural numbers that occur in various counting problems, often involving recursively defined objects. ...
A vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains all the digits from x and...
A highly totient number k is an integer that has more solutions to the equation φ(x) = k, where φ is Eulers totient function, than any integer below it. ...
In mathematics, a polygonal number is a number that can be arranged as a regular polygon. ...
A pentagonal pyramidal number is a number equal to the sum of the first few pentagonal numbers. ...
A tiling with squares whose sides are successive Fibonacci numbers in length A Fibonacci spiral, created by drawing arcs connecting the opposite corners of squares in the Fibonacci tiling shown above - see golden spiral. ...
### 1500-1749 - 1501 - centered pentagonal number
- 1511 - Sophie Germain prime, balanced prime
- 1513 - centered square number
- 1518 - Mertens function zero
- 1519 - Mertens function zero
- 1520 - pentagonal number, Mertens function zero, forms a Ruth-Aaron pair with 1521 under second definition
- 1521 - 39
^{2}, Mertens function zero, centered octagonal number, forms a Ruth-Aaron pair with 1520 under second definition - 1523 - Mertens function zero, safe prime, member of the Mian-Chowla sequence
- 1524 - Mertens function zero
- 1525 - heptagonal number, Mertens function zero
- 1527 - Mertens function zero
- 1528 - Mertens function zero
- 1530 - vampire number
- 1531 - Mertens function zero
- 1532 - Mertens function zero
- 1535 - Thabit number
- 1537 - Keith number, Mertens function zero
- 1540 - triangular number, hexagonal number, decagonal number, tetrahedral number
- 1543 - Mertens function zero
- 1544 - Mertens function zero
- 1546 - Mertens function zero
- 1556 - sum of the squares of the first nine primes
- 1559 - Sophie Germain prime
- 1560 - pronic number
- 1564 - sum of totient function for first 71 integers
- 1572 - member of the Mian-Chowla sequence
- 1575 - odd abundant number
- 1583 - Sophie Germain prime
- 1588 - sum of totient function for first 72 integers
- 1593 - sum of the first 30 primes
- 1596 - triangular number
- 1597 - Fibonacci number, Markov number,Prime Number, emirp
- 1600 - 40
^{2}, street number on Pennsylvania avenue of the White House, perfect score on SAT - 1601 - Sophie Germain prime, the novel
*1601 (Mark Twain)* - 1616 - the year Shakespeare died
- 1617 - pentagonal number
- 1618 - centered heptagonal number
- 1619 - safe prime
- 1625 - centered square number
- 1626 - centered pentagonal number
- 1633 - star number
- 1638 - harmonic divisor number
- 1639 - nonagonal number
- 1640 - pronic number
- 1649 - highly cototient number, Leyland number
- 1651 - heptagonal number
- 1653 - triangular number, hexagonal number
- 1657 - cuban prime
- 1660 - sum of totient function for first 73 integers
- 1666 - largest efficient pandigital number in Roman numerals (each symbol occurs exactly once)
- 1679 - highly cototient number
- 1680 - highly composite number
- 1681 - 41
^{2}, smallest number yielded by the formula *n*^{2} + *n* + 41 that is not a prime; centered octagonal number - 1682 - member of a Ruth-Aaron pair (first definition)
- 1683 - member of a Ruth-Aaron pair (first definition)
- 1695 - magic constant of
*n* × *n* normal magic square and n-Queens Problem for n = 15. - 1696 - sum of totient function for first 74 integers
- 1701 - decagonal number, hull number of the U.S.S. Enterprise on
*Star Trek* - 1705 - tribonacci number
- 1711 - triangular number
- 1717 - pentagonal number
- 1720 - sum of the first 31 primes
- 1722 - Giuga number, pronic number
- 1728 - the quantity expressed as 1000 in duodecimal, that is, the cube of twelve (called a great gross), and so, the number of cubic inches in a cubic foot
**1729** - taxicab number, Carmichael number, Zeisel number, centered cube number. In the decimal expansion of e the first time all 10 digits appear in sequence starts at the 1729th decimal place. In 1979 the rock musical Hair closed on Broadway in New York City after 1729 performances. - 1733 - Sophie Germain prime
- 1736 - sum of totient function for first 75 integers
- 1741 - centered square number
- 1747 - balanced prime
A vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains all the digits from x and...
A Thabit number is an integer of the form . ...
In mathematics, an abundant number or excessive number is a number n for which Ïƒ(n) > 2n. ...
A tiling with squares whose sides are successive Fibonacci numbers in length A Fibonacci spiral, created by drawing arcs connecting the opposite corners of squares in the Fibonacci tiling shown above - see golden spiral. ...
A Markov number or Markoff number is an integer x, y or z that is part of a solution to the Markov Diophantine equation The first few Markov numbers are 1, 2, 5, 13, 29, 34, 89, 169, 194, 233, 433, 610, 985, 1325, ... (sequence A002559 in OEIS) appearing in...
In mathematics, a prime number (or a prime) is a positive integer that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. ...
An emirp (prime spelt backwards) is a prime number that gives you a different prime when its digits are reversed (not a palindromic prime). ...
For other uses, see White House (disambiguation). ...
The SAT Reasoning Test is a standardized test for college admissions in the United States. ...
[Date: 1601. ...
A harmonic divisor number, or Ore number, is a number whose divisors, averaged in a harmonic mean, results in an integer. ...
A cuban prime is a prime number that is a solution to one of two different specific equations involving third powers of x and y. ...
The magic constant of a magic square, an n-by-n matrix, is defined such that the sum of any row, column or main diagonal yields the same result, denoted M2(n). ...
It has been suggested that Date magic square be merged into this article or section. ...
One possible solution The eight queens puzzle is the problem of putting eight chess queens on an 8Ã—8 chessboard such that none of them is able to capture any other using the standard chess queens moves. ...
The current Star Trek franchise logo Star Trek is an American science fiction entertainment series. ...
In mathematics, the Fibonacci numbers form a sequence defined recursively by: In words: you start with 0 and 1, and then produce the next Fibonacci number by adding the two previous Fibonacci numbers. ...
A Giuga number is a composite number n such that each of its distinct prime factors pi is a divisor of . ...
The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ...
Look up twelve in Wiktionary, the free dictionary. ...
A great gross is equal to a dozen gross, i. ...
An inch (plural: inches; symbol or abbreviation: in or, sometimes, â€³ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ...
A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ...
1729 Cardinal One thousand seven hundred [and] twenty-nine Ordinal 1729th Factorization Divisors 7, 13, 19, 91, 133, 247 Roman numeral MDCCXXIX Binary 11011000001 Octal 3301 Duodecimal 1001 Hexadecimal 6C1 1729 is known as the Hardy-Ramanujan number, after a famous anecdote of the British mathematician G. H. Hardy regarding...
In mathematics, the n-th taxicab number, typically denoted Ta(n) or Taxicab(n), is defined as the smallest number which can be expressed as a sum of two positive cubes in n distinct ways, up to order of summands. ...
e is the unique number such that the value of the derivative (slope of a tangent line) of f (x)=ex (blue curve) at the point x=0 is exactly 1. ...
Hair, subtitled The American Tribal Love/Rock Musical, is a musical about hippies and was a significant part of the drug, music and peace-love culture of the 1960s. ...
### 1750-1999 - 1753 - balanced prime
- 1756 - centered pentagonal number
- 1764 - 42
^{2} - 1770 - triangular number, hexagonal number, Town of Seventeen Seventy in Australia
- 1771 - tetrahedral number
- 1772 - centered heptagonal number, sum of totient function for first 76 integers
- 1782 - heptagonal number
- 1785 - square pyramidal number
- 1791 - largest natural number that cannot be expressed as a sum of at most four hexagonal numbers.
- 1794 - nonagonal number
- 1800 - pentagonal pyramidal number, also, in da Ponte's
*Don Giovanni*, the number of women Don Giovanni had slept with so far when confronted by Donna Elvira, according to Leporello's tally - 1801 - cuban prime
- 1806 - pronic number, product of first four terms of Sylvester's sequence, primary pseudoperfect number
- 1807 - fifth term of Sylvester's sequence
- 1811 - Sophie Germain prime
- 1820 - pentagonal number, pentatope number
- 1821 - member of the Mian-Chowla sequence
- 1823 - safe prime
- 1827 - vampire number
- 1828 - meandric number, open meandric number
- 1830 - triangular number
- 1832 - sum of totient function for first 77 integers
- 1834 - octahedral number, sum of the cubes of the first five primes
- 1836 - factor by which a proton is more massive than an electron
- 1837 - star number
- 1841 - Mertens function zero
- 1843 - Mertens function zero
- 1844 - Mertens function zero
- 1845 - Mertens function zero
- 1849 - 43
^{2}, centered octagonal number - 1851 - sum of the first 32 primes
- 1853 - Mertens function zero
- 1854 - Mertens function zero
- 1856 - sum of totient function for first 78 integers
- 1857 - Mertens function zero
- 1861 - centered square number, Mertens function zero
- 1862 - Mertens function zero, forms a Ruth-Aaron pair with 1863 under second definition
- 1863 - Mertens function zero, forms a Ruth-Aaron pair with 1862 under second definition
- 1864 - Mertens function zero
- 1866 - Mertens function zero
- 1870 - decagonal number
- 1885 - Zeisel number
- 1889 - Sophie Germain prime, highly cototient number
- 1891 - triangular number, hexagonal number, centered pentagonal number
- 1892 - pronic number
- 1896 - member of the Mian-Chowla sequence
- 1897 - member of Padovan sequence
- 1900 - 1900 or Novecento is a 1977 movie
- 1901 - Sophie Germain prime
- 1907 - safe prime, balanced prime
- 1918 - heptagonal number
- 1926 - pentagonal number
- 1929 - Mertens function zero
- 1931 - Sophie Germain prime
- 1933 - centered heptagonal number
- 1934 - sum of totient function for first 79 integers
- 1936 - 44
^{2} - 1938 - Mertens function zero
- 1951 - cuban prime
- 1953 - triangular number
- 1956 - nonagonal number
- 1966 - sum of totient function for first 80 integers
- 1969 - the movie
*1969 (film)* - 1973 - Sophie Germain prime
- 1980 - pronic number
- 1984 - 11111000000 in binary also see 1984 (disambiguation)
- 1985 - centered square number
- 1988 - sum of the first 33 primes
A hexagonal number is a figurate number that represents a hexagon. ...
Don Giovanni (K.527) is an opera in two acts with music by Wolfgang Amadeus Mozart and libretto by Lorenzo da Ponte. ...
Sylvesters sequence consists of the coprime denominators of an Egyptian fraction that adds up to 1. ...
In mathematics, and in particular number theory, a primary pseudoperfect number is a number N that satisfies the Egyptian fraction equation where the sum is over only the prime divisors of N. Equivalently (as can be seen by multiplying this equation by N), Except for the exceptional primary pseudoperfect number...
A vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains all the digits from x and...
In mathematics, a meander or closed meander is a self-avoiding closed curve which intersects a line a number of times. ...
In mathematics, a meander or closed meander is a self-avoiding closed curve which intersects a line a number of times. ...
In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1. ...
e- redirects here. ...
Movie poster for 1900 1900 (also called Novecento) is a 1976 epic film starring Robert de Niro, Gerard Depardieu, and Burt Lancaster, directed by Bernardo Bertolucci. ...
1969 is a 1988 film starring Robert Downey Jr. ...
The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ...
1984 may refer to: 1984, the year 1984, the number 1984, a band formed by Brian May prior to the creation of his hugely successful band Queen Nineteen Eighty-Four, a 1949 novel by George Orwell Nineteen Eighty-Four (TV programme), a 1954 television adaptation by the BBC 1984 (1956...
## Reference - Meehan, Eileen R.,
*Why TV is not our fault : television programming, viewers, and who's really in control* Lanham, MD: Rowman & Littlefield, 2005 |