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 A177912 #13 Jun 06 2021 06:02:59
%S A177912 1,11,253,11891,77209,768361,1775807,17666737,36112967,61488361,
%T A177912 83462929,154261943,173185331,591303757,830336639,971656873,
%U A177912 2936791979,4139054953,5393125859,8139710557,8142849781,45667873031,53653880269
%N A177912 Numbers k such that k^3 divides 12^(k^2) - 1.
%C A177912 11 divides a(n) for n > 1.
%t A177912 Join[{1}, Select[Range[3000000], PowerMod[12, #^2, #^3] == 1 &]] (* _Robert Price_, Mar 31 2020 *)
%Y A177912 Cf. A014951 (k divides 12^k-1), A128405 (k^2 divides 12^k-1).
%Y A177912 Cf. A129211, A129212, A177905, A127106, A177907, A127102, A177909, A177243.
%Y A177912 Cf. A177911, A177912, A177913, A177914, A177915, A177916, A177917, A177918, A177919, A177920.
%K A177912 nonn
%O A177912 1,2
%A A177912 _Alexander Adamchuk_, May 14 2010
%E A177912 More terms from _Max Alekseyev_, Oct 02 2010