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 A231917 #10 Apr 03 2023 10:36:13 %S A231917 0,11,75,156,179,215,216,239,371,431,504,551,564,624,651,711,936,999, %T A231917 1040,1076,1296,1304,1416,1680,1884,1911,2079,2324,2615,2696,3176, %U A231917 3224,3236,3500,3696,3780,3879,4040,4044,4215,4340,4368,4431,4599,4604,4859,5019 %N A231917 Numbers n such that 16*n^2 + 10*n + 1 divides 2^n - 1. %C A231917 The prime numbers of this sequence are in A231916. %H A231917 Chris Caldwell, The Prime Glossary, <a href="https://t5k.org/glossary/xpage/MersenneNumber.html">Mersenne number</a> %t A231917 Prepend[Select[Range[5019], PowerMod[2, #, 16*#^2 + 10*# + 1] == 1 &], 0] %Y A231917 Subsequence of A081858. Supersequence of A231916. %Y A231917 Cf. A000225, A028993, A231918. %K A231917 nonn %O A231917 1,2 %A A231917 _Arkadiusz Wesolowski_, Nov 15 2013