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 A127107 #7 Apr 16 2016 03:03:33 %S A127107 1,2,3,4,6,8,12,20,24,40,57,60,100,114,120,156,200,220,228,258,300, %T A127107 312,440,456,516,600,660,780,1032,1100,1140,1320,1560,1640,1752,1860, %U A127107 2172,2200,2280,2580,2964,3300,3660,3720,3820,3900,4344,4632,4902,4920,5060 %N A127107 Numbers n such that n^2 divides 7^n-1. %H A127107 G. C. Greubel, <a href="/A127107/b127107.txt">Table of n, a(n) for n = 1..1000</a> %t A127107 Select[Range[10000], IntegerQ[(PowerMod[7, #, #^2 ]-1)/#^2 ]&] %Y A127107 Cf. A127100, A127101, A127102, A127103, A123104, A127105, A127106, A127092. Cf. A067947 = numbers n such that n divides 7^n-1. %K A127107 nonn %O A127107 1,2 %A A127107 _Alexander Adamchuk_, Jan 05 2007