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 A218714 #4 Nov 05 2012 12:19:09
%S A218714 0,9,378,11389,1251967,46464143,2363588163,92615568742,287369842623,
%T A218714 112076323050317,2403749863808044,56094387104417648,
%U A218714 1156752450536914530,43970228150195457632,10132163897314954464899,503212117431217218892992,19164391897329672149556204
%N A218714 a(n) is smallest number such that a(n)^2 + 1 is divisible by 41^n.
%e A218714 a(3) = 11389 because 11389^2+1 = 2 * 41 ^ 3 * 941.
%t A218714 b=9;n41=41;jo=Join[{0,b},Table[n41=41*n41;b=PowerMod[b,41,n41];b=Min[b,n41-b],{99}]]
%Y A218714 Cf. A002522, A049532, A034939, A218709, A218710, A218712, A218713.
%K A218714 nonn
%O A218714 0,2
%A A218714 _Michel Lagneau_, Nov 04 2012