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 A090610 #7 Aug 04 2021 02:23:49 %S A090610 5,7,13,26,30,60,66,71,79,113,123,135,160,227,255,265,288,338,342,353, %T A090610 392,408,484,514,517,538,660,666,719,736,771,852,869,973,1034,1081, %U A090610 1111,1133,1251,1269,1309,1362,1396,1448,1456,1477,1482,1592,1656,1702,1756 %N A090610 A090609 indexed by A000040. %F A090610 a(n)=k such that A000040(k)=A090609(n). %Y A090610 Cf. A089144, A090606, A090607, A090608, A090609. %K A090610 nonn,easy %O A090610 1,1 %A A090610 _Ray Chandler_, Dec 06 2003 %E A090610 Offset changed to 1 by _Jinyuan Wang_, Aug 03 2021