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 A135624 #3 Mar 11 2014 01:34:11 %S A135624 6,82,694,8218,63305533,6509689858,823196834731,8212599318003485032, %T A135624 6712483595162964564471389651995548562, %U A135624 612961845123799031836303480873397492701632806249165191 %N A135624 Perfect numbers written backwards. %H A135624 Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a>. %e A135624 a(3)=694 because the 3rd perfect number is 496. %Y A135624 Cf. A000396, A004087. %K A135624 base,easy,nonn %O A135624 1,1 %A A135624 _Omar E. Pol_, Feb 17 2008