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 A144641 #5 Aug 25 2012 21:24:32 %S A144641 2,3,6,11,59,176,310 %N A144641 Indices of harmonic (or Ore) numbers (A001599) that are also perfect numbers. %Y A144641 Cf. A000396, A001599. %K A144641 more,nonn %O A144641 1,1 %A A144641 _Omar E. Pol_, Jan 19 2009 %E A144641 a(6)-a(7) from _Donovan Johnson_, Aug 25 2012