131 is the natural number following 130 and preceding 132. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 130 is the natural number following 129 and preceding 131. ... 132 is the natural number following 131 and preceding 133. ...

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 prime number (or a prime) is a natural number that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. ... 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. ... 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 0–9 and A–F, or a–f. ...

In mathematics

131 is a Sophie Germain prime, the second 3-digit palindromic prime, and also a permutable prime with 113 and 311. It can be expressed as the sum of three consecutive primes, 131 = 41 + 43 + 47. 131 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. Because the next odd number, 133, is a semiprime, 131 is a Chen prime. A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ... A palindromic prime is a prime number that is also a palindromic number. ... A permutable prime (sometimes called a primutation) is a prime number, which, in a given base, can have its digits switched to any possible permutation and still spell a prime number. ... 113 is the natural number following 112 and preceding 114. ... An Eisenstein prime is an Eisenstein integer aω + b that has only two Eisenstein divisors, the complex cube root of unity and aω + b itself. ... A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes (that is, if ,where is the Big Omega function. ...

In other fields

• The yearsss 131 and 131 BC.