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 A127106 #10 Jul 21 2025 16:04:45 %S A127106 1,5,1555,9673655,187159211791705,776119592182705 %N A127106 Numbers k such that k^2 divides 6^k-1. %C A127106 Subsequence of A014946. %t A127106 Select[Range[20000], IntegerQ[(PowerMod[6, #, #^2 ]-1)/#^2 ]&] %Y A127106 Cf. A127100, A127101, A127102, A127103, A127104, A127105, A127107, A127092, A014946. %K A127106 hard,more,nonn %O A127106 1,2 %A A127106 _Alexander Adamchuk_, Jan 05 2007 %E A127106 Two more terms from _Max Alekseyev_, May 05 2010