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 A137857 #6 Jan 04 2013 16:03:57 %S A137857 1,2,3,4,5,6,7,8,9,10,53,106,298,5790,7594,14650,15576,41612,66049, %T A137857 150564,154476,154484 %N A137857 Fixed points of A067581. %C A137857 A067581(a(n)) = a(n). %C A137857 Searched up to A067581(10^7). The smallest integer not yet in A067581 is 2746513. [From _Donovan Johnson_, Oct 01 2009] %K A137857 nonn,more,base %O A137857 1,2 %A A137857 _Reinhard Zumkeller_, Feb 15 2008 %E A137857 a(16)-a(22) from _Donovan Johnson_, Oct 01 2009