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Encyclopedia > 30 (number)

30 (thirty) is the natural number following 29 and preceding 31. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 29 (twenty-nine) is the natural number following 28 and preceding 30. ... 31 (thirty-one) is the natural number following 30 and preceding 32. ...

 ← 30 31 32 33 34 35 36 37 38 39 → 29 (twenty-nine) is the natural number following 28 and preceding 30. ... 31 (thirty-one) is the natural number following 30 and preceding 32. ... 32 (thirty-two) is the natural number following 31 and preceding 33. ... 33 (thirty-three) is the natural number following 32 and preceding 34. ... 34 (thirty-four) is the natural number following 33 and preceding 35. ... 35 (thirty-five) is the natural number following 34 and preceding 36. ... 36 (thirty-six) is the natural number following 35 and preceding 37. ... 37 (thirty-seven) is the natural number following 36 and preceding 38. ... 38 (thirty-eight) is the natural number following 37 and preceding 39. ... 39 (thirty-nine) is the natural number following 38 and preceding 40. ... 40 (forty) is the natural number following 39 and preceding 41. ... List of numbers — Integers This is a list of articles about numbers (not about numerals). ... The integers are commonly denoted by the above symbol. ... 0 10 20 30 40 50 60 70 80 90 → For other senses of this word, see zero or 0. ... This article is about the number 10. ... 20 (twenty) is the natural number following 19 and preceding 21. ... 40 (forty) is the natural number following 39 and preceding 41. ... 50 (fifty) is the number following 49 and preceding 51. ... 60 (sixty) is the natural number following 59 and preceding 61. ... Look up seventy in Wiktionary, the free dictionary. ... 80 (eighty) is the natural number following 79 and preceding 81. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ... Cardinal 30 thirty Ordinal 30th thirtieth Numeral system trigesimal Factorization $2cdot 3cdot 5$ Divisors 1, 2, 3, 5, 6, 10, 15, 30 Roman numeral XXX Roman numeral (Unicode) XXX, xxx Binary 11110 Octal 36 Duodecimal 26 Hexadecimal 1E Hebrew ל (Lamed)
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## Contents

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, known as its cardinality. ... In set theory, ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. ... This article is about different methods of expressing numbers with symbols. ... Base 30 or trigesimal is a positional numeral system using 30 as the radix. ... ... 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. ... 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. ... The Modern Hebrew language is a Semitic language of the Afro-Asiatic language family. ... Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...

## In mathematics

It is a primorial as well as the sum of the squares of the integers 1, 2, 3 and 4. It is the smallest Giuga number. For n &#8805; 2, the primorial n# is the product of all prime numbers less than or equal to n. ... A Giuga number is a composite number n such that each of its distinct prime factors pi is a divisor of . ...

30 is the smallest sphenic number, and the smallest of the form $2cdot 3cdot r$ where r is a prime greater than 3. 30 has an aliquot sum of 42 and all sphenic numbers of this form have an aliquot sum 12 greater than themselves. The aliquot sequence of 30 is 16 members long, it comprises (30,42,54,66,90,144,259,45,33,15,9,4,3,1,0) A sphenic number is a positive integer that is the product of three distinct prime factors. ... Divisor function Ïƒ0(n) up to n=250 Sigma function Ïƒ1(n) up to n=250 Sum of the squares of divisors, Ïƒ2(n), up to n=250 Sum of cubes of divisors, Ïƒ3(n) up to n=250 In mathematics, and specifically in number theory, a divisor function is... Wikipedia does not yet have an article with this exact name. ... Divisor function Ïƒ0(n) up to n=250 Sigma function Ïƒ1(n) up to n=250 Sum of the squares of divisors, Ïƒ2(n), up to n=250 Sum of cubes of divisors, Ïƒ3(n) up to n=250 In mathematics, and specifically in number theory, a divisor function is... In mathematics, an aliquot sequence is a recursive sequence which can be defined in the following way: if we write Ïƒ(n) = Ïƒ1(n) to be the divisor function normally, then, the aliquot sequence of k can be written: s0 = k sn = Ïƒ(snâˆ’1) âˆ’ snâˆ’1 For example, the aliquot sequence...

It is the sum of the first four squares, which makes it a square pyramidal number. Adding up some subsets of its divisors (e.g., 5, 10 and 15) gives 30, hence 30 is a semiperfect number. A pyramidal number, or square pyramidal number, is a figurate number that represents a pyramid with a base and four sides. ... In mathematics, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. ...

30 is the largest number such that coprimes smaller than itself are also prime.[1] In mathematics, the integers a and b are said to be coprime or relatively prime if they have no common factor other than 1 and âˆ’1, or equivalently, if their greatest common divisor is 1. ...

A polygon with thirty sides is called a tricontagon. Both an icosahedron and a dodecahedron have 30 edges. Look up polygon in Wiktionary, the free dictionary. ... Image:Triacontagon. ... [Etymology: 16th century: from Greek eikosaedron, from eikosi twenty + -edron -hedron], icosahedral adjective An icosahedron noun (plural: -drons, -dra ) is any polyhedron having 20 faces, but usually a regular icosahedron is implied, which has equilateral triangles as faces. ... A dodecahedron is any polyhedron with twelve faces, but usually a regular dodecahedron is meant: a Platonic solid composed of twelve regular pentagonal faces, with three meeting at each vertex. ...

E8 has Coxeter number 30. Graph of E8 Gosset polytope, 42,1 Coxeter-Dynkin diagram: . It features superscript or subscript characters that are substituted or omitted because of technical limitations. ... The introduction of this article does not provide enough context for readers unfamiliar with the subject. ...

30 is a Harshad number. A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ...

## In science

See also: List of elements by atomic number In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. ... General Name, symbol, number zinc, Zn, 30 Chemical series transition metals Group, period, block 12, 4, d Appearance bluish pale gray Standard atomic weight 65. ...

Thirty is:

## Historical years

30 A.D., 30 B.C., 1930, 2030, etc. Events The Sermon on the Mount (according to proponents of the 33 theory) April 7 - Crucifixion of Jesus (suggested date, but it is also suggested that he died on April 3, AD 33) Births Quintus Petillius Cerialis, brother-in-law of Vespasian Deaths April 7 - Judas Iscariot, disciple of Jesus... Octavian becomes Roman Consul for the fourth time. ... Year 1930 (MCMXXX) was a common year starting on Wednesday (link will display 1930 calendar) of the Gregorian calendar. ... 2030 (MMXXX) will be a common year starting on Tuesday of the Gregorian calendar. ...

## In sports

Ryan Miller (born July 17, 1980 in East Lansing, Michigan) is an American ice hockey goaltender for the Buffalo Sabres in the NHL, wearing number 30. ... The Buffalo Sabres are a professional ice hockey team based in Buffalo, New York. ... Martin Pierre Brodeur (IPA: ) (born May 6, 1972, in Montreal, Quebec) is a professional ice hockey goaltender who has played his entire National Hockey League career with the New Jersey Devils. ... The New Jersey Devils are a professional ice hockey team based in Newark, New Jersey. ... Ko Simpson is an american football safety who currently plays for the National Football Leagues Buffalo Bills. ... For other uses, see Buffalo Bills (disambiguation). ... Ahman Rashad Green (born February 16, 1977 in Omaha, Nebraska, U.S.) is an American football running back who plays for the Houston Texans of the National Football League. ... This article is about the current National Football League team. ...

## Music

30 is an album by American artist Harry Connick, Jr. ... â€¹ The template below (Taginfo) is being considered for deletion. ... 30 Seconds to Mars (or Thirty Seconds to Mars) is an alternative rock band from Los Angeles, California, featuring actor Jared Leto as the lead vocalist. ...

## In Age of Empires 2

In the computer game, Age of Empires 2, when a player types the number thirty into the chat during the game lobby, or while playing a game, a voice clip of a man saying "Woo loo loo" is played. A computer game is a game composed of a computer-controlled virtual universe that players interact with in order to achieve a defined goal or set of goals. ... Age of Empires II: The Age of Kings (or simply Age of Kings) is a real-time strategy computer game set in the middle ages, released in 1999. ... A player of a game is a participant therein. ... For other uses, see Number (disambiguation). ... For other uses, see Game (disambiguation). ... The word voice can be used to refer to: Sound: The human voice. ...

## References

1. ^ Michael Slone, Every positive integer greater than 30 has at least one composite totative from PlanetMath. Accessed 24 April 2007

Results from FactBites:

 30 (number) - Wikipedia, the free encyclopedia (401 words) 30 is the largest number such that coprimes smaller than itself are also prime. The Saros number of the solar eclipse series which began on -2069 October 2 and ended on -572 March 18. Further, the Saros number of the lunar eclipse series which began on -1803 June 19 and ended on -487 August 18.
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