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 A231916 #9 Apr 03 2023 10:36:13 %S A231916 11,179,239,431,5231,7079,7211,13451,14879,17939,26111,28019,28499, %T A231916 30851,36479,39779,40559,43391,44699,45179,48731,49919,50411,66791, %U A231916 68111,74099,74699,79151,79811,83459,87299,96731,96779,101399,102551,103391,111959,116411 %N A231916 Primes p such that 16*p^2 + 10*p + 1 divides 2^p - 1. %H A231916 Chris Caldwell, The Prime Glossary, <a href="https://t5k.org/glossary/xpage/MersenneNumber.html">Mersenne number</a> %H A231916 C. K. Caldwell, "Top Twenty" page, <a href="https://t5k.org/top20/page.php?id=49">Mersenne cofactor</a> %t A231916 Select[Prime@Range[10996], PowerMod[2, #, 16*#^2 + 10*# + 1] == 1 &] %Y A231916 Subsequence of A002515 and of A231917. Supersequence of A231918. %Y A231916 Cf. A001348, A028993. %K A231916 nonn %O A231916 1,1 %A A231916 _Arkadiusz Wesolowski_, Nov 15 2013