131 (number)
131 (one hundred thirty one) is the natural number following 130 and preceding 132.
In mathematicsEdit
131 is a Sophie Germain prime,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> an irregular prime,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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 <math>3n - 1</math>. Because the next odd number, 133, is a semiprime, 131 is a Chen prime. 131 is an Ulam number.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
131 is a full reptend prime in base 10 (and also in base 2). The decimal expansion of 1/131 repeats the digits 007633587786259541984732824427480916030534351145038167938931 297709923664122137404580152671755725190839694656488549618320 6106870229 indefinitely.
131 is the fifth discriminant of imaginary quadratic fields with class number 5, where the 131st prime number 739 is the fifteenth such discriminant.<ref>Template:Cite OEIS</ref> Meanwhile, there are conjectured to be a total of 131 discriminants of class number 8 (only one more discriminant could exist).<ref>Template:Cite OEIS</ref>