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 A091183 #3 Mar 30 2012 17:29:14 %S A091183 1,4,5,13,17,71,31,53,109,67,97,143,197,101,253,223,137,193,277,319, %T A091183 461,269,547,367,473,353,283,529,361,563,889,431,577,809,661,739,857, %U A091183 599,913,1081,899,973,811,1109,613,647,1061,781,1369,907,1373,1039,1381 %N A091183 Index of first occurrence of n in A091182. %Y A091183 Cf. A014574, A090695, A091182. %K A091183 nonn %O A091183 0,2 %A A091183 _Ray Chandler_, Dec 27 2003