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31

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Cardinal thirty-one
Ordinal 31st
(thirty-first)
Factorization prime
Divisors 1, 31
Roman numeral XXXI
Binary 11111
Hexadecimal 1F

31 (thirty-one) is the natural number following 30 and preceding 32. 30 ( thirty) is the Natural number following 29 and preceding 31. 32 ( thirty-two) is the Natural number following 31 and preceding 33. 29 ( twenty-nine) is the Natural number following 28 and preceding 30. 30 ( thirty) is the Natural number following 29 and preceding 31. 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. This article discusses the number thirty-eight. For the year 38 CE see 38. 39 ( thirty-nine) is the Natural number following 38 and preceding 40. 40 ( forty) is the Natural number following 39 and preceding 41. This is a list of articles about Numbers ( not about Numerals. The integers (from the Latin integer, literally "untouched" hence "whole" the word entire comes from the same origin but via French "Twenty" redirects here For the village in England, see Twenty Lincolnshire. 30 ( thirty) is the Natural number following 29 and preceding 31. 40 ( forty) is the Natural number following 39 and preceding 41. This article discusses the number fifty. For the year 50 CE see 50. 60 ( sixty) is the Natural number following 59 and preceding 61. 70 ( seventy) is the Natural number following 69 and preceding 71. 80 ( eighty) is the Natural number following 79 and preceding 81. 90 ( ninety) is the Natural number preceded by 89 and followed by 91. This article describes cardinal numbers in mathematics For cardinals in linguistics see Names of numbers in English. In linguistics ordinal numbers are the words representing the rank of a number with respect to some order in particular order or position (i In Mathematics, factorization ( also factorisation in British English) or factoring is the decomposition of an object (for In Mathematics, a prime number (or a prime) is a Natural number which has exactly two distinct natural number Divisors 1 In Mathematics, a divisor of an Integer n, also called a factor of n, is an integer which evenly divides n without Roman numerals are a Numeral system originating in ancient Rome, 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. In Mathematics and Computer science, hexadecimal (also base -, hexa, or hex) is a Numeral system with a In Mathematics, a natural number (also called counting number) can mean either an element of the set (the positive Integers or an 30 ( thirty) is the Natural number following 29 and preceding 31. 32 ( thirty-two) is the Natural number following 31 and preceding 33.

Contents

In mathematics

Thirty-one is the third Mersenne prime ( 25 - 1 ) as well as the fourth primorial prime, and together with twenty-nine, another primorial prime, it comprises a twin prime. In Mathematics, a Mersenne number is a positive integer that is one less than a Power of two: M_n=2^n-1 In Mathematics, primorial primes are Prime numbers of the form pn # ± 1 where pn # is the 29 ( twenty-nine) is the Natural number following 28 and preceding 30. A twin prime is a Prime number that differs from another prime number by Two. As a Mersenne prime, 31 is related to the perfect number 496, since 496 = 25 - 1 ( 25 - 1). In mathematics a perfect number is defined as a positive integer which is the sum of its proper positive Divisors that is the sum of the positive divisors excluding Four hundred ninety-six is the Natural number following four hundred ninety-five and preceding four hundred ninety-seven 31 is the eighth Mersenne prime exponent. In Mathematics, a Mersenne number is a positive integer that is one less than a Power of two: M_n=2^n-1 31 is also the 4th lucky prime and the 11th supersingular prime. In Number theory, a lucky number is a Natural number in a set which is generated by a " sieve " similar to the Sieve of Eratosthenes If E is an Elliptic curve defined over the Rational numbers then a prime p is supersingular for E if the reduction

31 is a centered triangular number, a centered pentagonal number and centered decagonal number. A centered triangular number is a centered Figurate number that represents a Triangle with a dot in the center and all other dots surrounding the center 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 A centered decagonal number is a centered Figurate number that represents a Decagon with a dot in the center and all other dots surrounding the center

At 31, the Mertens function sets a new low of -4, a value which is not subceded until 110. In Number theory, the Mertens function is M(n = \sum_{1\le k \le n} \mu(k where μ(k is the Möbius function.

No integer added up to its base 10 digits results in 31, making 31 a self number. A self number, Colombian number or Devlali number is an Integer which in a given base, cannot be generated by any other integer added to the

31 is a repdigit in base 5 (111), and base 2 (11111). In Recreational mathematics, a repdigit is a Natural number composed of repeated instances of the same digit most often in the decimal numeral system.

The numbers 31, 331, 3331, 33331, 333331, 3333331, and 33333331 are all prime. For a time it was thought that every number of the form 3w1 would be prime. However, the next nine numbers of the sequence are composite; their factorisations are:

The recurrence of the factor 31 in the last number above can be used to prove that no sequence of the type RwE or ERw can consist only of primes because every prime in the sequence will periodically divide further numbers. A composite number is a positive Integer which has a positive Divisor other than one or itself In Mathematics, factorization ( also factorisation in British English) or factoring is the decomposition of an object (for 17 ( seventeen) is the Natural number following 16 and preceding 18. 19 ( nineteen) is the Natural number following 18 and preceding 20. In mathematics Eighty-three is the sum of three consecutive primes (23 + 29 + 31 as well as the sum of five consecutive primes (11 + 13 + 17 + 19 + 23 181 is the natural number between 180 and 182. In mathematics 181 is a Prime number, and a Twin prime with 179 199 is the Natural number between 198 and 200. It is also a Prime number. Here, 31 divides every fifteenth number in 3w1 (and 331 every 110th).

In science

Astronomy

In sports

In other fields

Thirty-one is also:

Historical years

31 A.D., 31 B.C., 1931, 2031, etc. Jim or Jimmy Taylor may refer to Jim Taylor (American football (born 1935 American football player Jim Taylor (explorer The Netherlands ( Dutch:, ˈnedərlɑnt is the European part of the Kingdom of the Netherlands, which consists of the Netherlands the Netherlands A card game is any Game using Playing cards either traditional or game-specific Thirty-one (also known as Big Tonka, Blitz, Scat, or Cadillac in south Louisiana is a Card game played by two to seven people Backgammon is a Board game for two players in which the playing pieces are moved according to the roll of Dice. Baskin-Robbins is a global chain of Ice cream parlors founded by Burt Baskin and Irv Robbins in 1945 in Glendale California. Ice cream or ice-cream (originally iced cream) is a frozen dessert made from Dairy products such as Milk and Cream, combined For a topic outline on this subject see List of basic Japan topics. In the Star Trek Fictional universe, Section 31 is the name of an unofficial intelligence and defense organization International Standard ISO 31 ( Quantities and units International Organization for Standardization, 1992 is the most widely respected style guide for the is a Franco - Japanese Anime series ( 1981) that updates the Greek and Roman Mythology of Odysseus (known 31 Songs (published in the United States of America as Songbook) is a 2002 collection of 26 essays by English writer Nick Hornby Masturbation refers to Sexual stimulation especially of one's own genitals ( self masturbation) and often to the point of Orgasm, which Year 31 was a Common year starting on Monday (link will display the full calendar of the Julian calendar. Year 31 BC was a Common year starting on Tuesday (link will display the full calendar of the Julian calendar. Year 1931 ( MCMXXXI) was a Common year starting on Thursday (link will display full 1931 calendar of the Gregorian calendar. 2031 ( MMXXXI) will be a Common year starting on Wednesday of the Gregorian Calendar.

References

  1. ^ Room, Adrian. The Guinness Book of Numbers Middlesex: Guinness Publishing Ltd. (1989): 128
The Prime Pages is a website about Prime numbers maintained by Prof
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