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 A090608 #8 Aug 04 2021 02:23:31 %S A090608 4,6,12,25,29,59,65,70,78,112,122,134,159,226,254,264,287,337,341,352, %T A090608 391,407,483,513,516,537,659,665,718,735,770,851,868,972,1033,1080, %U A090608 1110,1132,1250,1268,1308,1361,1395,1447,1455,1476,1481,1591,1655,1701,1755 %N A090608 A090607 indexed by A000040. %F A090608 a(n)=k such that A000040(k)=A090607(n). %Y A090608 Cf. A089144, A090606, A090607, A090609, A090610. %K A090608 nonn,easy %O A090608 1,1 %A A090608 _Ray Chandler_, Dec 06 2003 %E A090608 Offset changed to 1 by _Jinyuan Wang_, Aug 03 2021