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 A167516 #6 Mar 30 2012 18:52:35 %S A167516 1,2,1,2,3,4,5,3,6,7,8,4,9,10,11,12,13,14,15,16,5,17,18,19,20,21,22, %T A167516 23,24,6,25,26,27,28,29,30,31,32,33,34,35,36,37,7,38,39,40,41,42,43, %U A167516 44,45,8,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68 %N A167516 Index of A141468(n) in the isolated nonprimes A014574 or the non-isolated nonprimes A164276. %C A167516 A014574 U A164276 = A141468. %F A167516 A014574(a(n)-1)=n or A164276(a(n))=n. %Y A167516 Cf. A014574, A141468, A164276. %K A167516 nonn %O A167516 1,2 %A A167516 _Juri-Stepan Gerasimov_, Nov 05 2009 %E A167516 Corrected definition and formula index - _R. J. Mathar_, May 30 2010