permutable
71Quotient group — In mathematics, given a group G and a normal subgroup N of G , the quotient group, or factor group, of G over N is intuitively a group that collapses the normal subgroup N to the identity element. The quotient group is written G / N and is… …
72Mersenne prime — Named after Marin Mersenne Publication year 1536[1] Author of publication Regius, H. Number of known terms 47 Conjectured number of terms Infinite …
73Normal subgroup — Concepts in group theory category of groups subgroups, normal subgroups group homomorphisms, kernel, image, quotient direct product, direct sum semidirect product, wreath product …
74Repunit — In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1. The term stands for repeated unit and was coined in 1966 by A.H. Beiler. A repunit prime is a repunit that is also a prime… …
75Cullen number — In mathematics, a Cullen number is a natural number of the form n · 2n + 1 (written Cn). Cullen numbers were first studied by Fr. James Cullen in 1905. Cullen numbers are special cases of Proth numbers. Properties In 1976 Christopher Hooley… …
76Primeval number — In mathematics, a primeval number is a natural number n for which the number of prime numbers which can be obtained by permuting all or some of its digits (in base 10) is larger than the number of primes obtainable in the same way for any smaller …
7779 (number) — ← 78 80 → 79 ← 70 71 72 73 74 75 76 77 …
7871 (number) — ← 70 72 → 71 ← 70 71 72 73 74 75 76 …
7973 (number) — ← 72 74 → 73 ← 70 71 72 73 74 75 76 …
80113 (number) — ← 112 114 → 113 ← 110 111 112 113 114 115 116 …
