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 A179538 #9 Sep 13 2019 08:04:37
%S A179538 3,5,7,11,13,19,23,29,37,47,53,59,61,67,71,79,83,101,103,107,121,131,
%T A179538 139,149,163,167,173,179,181,191,197,199,211,227,239,263,269,271,293,
%U A179538 311,317,347,349,359,367,373,379,383,389,419,421,443,461,463,467,479
%N A179538 Numbers 2n+1 for which A003558(n), n>=1, are record values of A003558.
%C A179538 Conjecture. All terms are primes except for a finite set of squares of primes.
%C A179538 All terms from a(1) to a(5000) are primes except for a(21) = 121 = 11^2, supporting V. Shevelev's conjecture. [_John W. Layman_, Jul 22 2010]
%H A179538 Amiram Eldar, <a href="/A179538/b179538.txt">Table of n, a(n) for n = 1..10000</a>
%t A179538 s = {}; am = 0; Do[a = Min[MultiplicativeOrder[2, n, {-1, 1}]]; If[a > am, am = a; AppendTo[s, n]], {n, 3, 480, 2}]; s (* _Amiram Eldar_, Sep 13 2019 *)
%Y A179538 Cf. A003558, A139099, A179383, A179481.
%K A179538 nonn
%O A179538 1,1
%A A179538 _Vladimir Shevelev_, Jul 18 2010
%E A179538 a(31)-a(56) from _John W. Layman_, Jul 22 2010