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 A177919 #11 Jun 06 2021 02:42:35 %S A177919 1,2,3,4,6,9,10,12,18,20,30,36,42,60,68,78,84,90,110,126,156,180,204, %T A177919 210,220,222,234,252,294,330,340,362,381,390,420,438,444,468,546,588, %U A177919 612,630,654,660,666,724,762,780,820,876,882,930,990,1010,1014,1020 %N A177919 Numbers k such that k^3 divides 19^(k^2) - 1. %H A177919 Robert Price, <a href="/A177919/b177919.txt">Table of n, a(n) for n = 1..4378</a> %t A177919 Select[ Range[10^4], Mod[ PowerMod[ 19, #^2, #^3 ] - 1, #^3 ] == 0 &] %Y A177919 Cf. A129211, A129212, A177905, A127106, A177907, A127102, A177909, A177243. %Y A177919 Cf. A177911, A177912, A177913, A177914, A177915, A177916, A177917, A177918, A177919, A177920. %K A177919 nonn %O A177919 1,2 %A A177919 _Alexander Adamchuk_, May 14 2010