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 A093665 #5 Aug 22 2021 00:14:45 %S A093665 1,3,9,27,57,81,171,243,513,729,1083,1467,1539,2187,3249,4401,4617, %T A093665 6561,9747,13131,13203,13851,19683,20577,27873,29241,32547,39393, %U A093665 39609,41553,59049,61731,83619,87723,97641,118179,118827,124659,177147,185193 %N A093665 Numbers k that divide 2^(k^3) + 1. %t A093665 Select[ Range[ 249488], PowerMod[2, #^3, # ] == # - 1 &] %Y A093665 Cf. A006521, A093546. %K A093665 nonn %O A093665 1,2 %A A093665 _Robert G. Wilson v_, Apr 03 2004