This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A177879 #20 Apr 03 2023 10:36:12 %S A177879 7,97,31,708158977,127,22783,113210499946729046527,12289, %T A177879 1049179854847,22427452848394140276947044397991663611794141183,8191, %U A177879 29687809 %N A177879 The smallest odd prime factor of the Lucas-Lehmer number A003010(n). %C A177879 Does this sequence include all of the Mersenne primes greater than 3? %C A177879 a(8)=12289; a(11)=8191, a(15)=131071. %C A177879 Also the least prime factor of A002812(n). - _Michel Marcus_, Dec 16 2022 %C A177879 a(p-2) = 2^p-1 for all odd Mersenne exponents p in A000043? - _Thomas Ordowski_, Aug 12 2018 %H A177879 Chris Caldwell, <a href="https://t5k.org/mersenne/index.html">Mersenne primes</a> %e A177879 A003010(3)=37634 and its smallest odd prime factor is 31. %Y A177879 Cf. A000040, A003010, A000668, A002812. %K A177879 nonn,more %O A177879 1,1 %A A177879 _G. L. Honaker, Jr._, Dec 13 2010 %E A177879 More terms, using factordb, from _Michel Marcus_ and _Hugo Pfoertner_, Dec 16 2022