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 A091280 #3 Mar 30 2012 17:29:14 %S A091280 4,6,11,22,44,67,73,80,93,122,131,159,169,175,183,213,261,295,331,375, %T A091280 414,443,464,466,504,518,546,596,603,631,731,735,803,830,831,859,868, %U A091280 871,966,1033,1231,1326,1346,1356,1386,1551,1568,1580,1676,1683,1688 %N A091280 A091432 indexed by A000040. %F A091280 a(n)=k such that A000040(k)=A091432(n). %Y A091280 Cf. A000040, A007770, A000959, A091431, A091432. %K A091280 base,nonn %O A091280 1,1 %A A091280 _Ray Chandler_, Jan 18 2004