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 A177915 #13 Jun 06 2021 02:43:43
%S A177915 1,2,4,7,8,14,16,28,56,68,112,136,226,272,406,452,476,812,904,952,
%T A177915 1582,1624,1808,1904,2056,2758,3164,3248,4112,5516,5956,6328,7684,
%U A177915 9316,11032,11912,12656,13804,14392,15368,18632,21512,22064,23824,23954,25144
%N A177915 Numbers k such that k^3 divides 15^(k^2) - 1.
%H A177915 Robert Price, <a href="/A177915/b177915.txt">Table of n, a(n) for n = 1..205</a>
%t A177915 Join[{1}, Select[Range[30000], PowerMod[15, #^2, #^3] == 1 &]] (* _Robert Price_, Apr 04 2020 *)
%Y A177915 Cf. A129211, A129212, A177905, A127106, A177907, A127102, A177909, A177243.
%Y A177915 Cf. A177911, A177912, A177913, A177914, A177915, A177916, A177917, A177918, A177919, A177920.
%K A177915 nonn
%O A177915 1,2
%A A177915 _Alexander Adamchuk_, May 14 2010