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 A155838 #4 Mar 31 2012 13:20:40 %S A155838 2,5,13,61681,1235573,27544452149 %N A155838 Primes p such that p^2 divides A085606(2p-2) = (2p-3)^(2p-2) - 1. %C A155838 For p>3, (2p-3)^(2p-2) - 1 is divisible by p. %C A155838 Primes p such that 3^p == 3-2p (mod p^2). %C A155838 No other terms below 10^11. %Y A155838 Cf. A085606. %K A155838 hard,more,nonn %O A155838 1,1 %A A155838 _Alexander Adamchuk_, Jan 28 2009 %E A155838 27544452149 from _Max Alekseyev_, Oct 14 2009