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 A166052 #2 Mar 31 2012 13:21:20 %S A166052 2,79,151,175,223,265,275,283,361,373,571,595,635,805,991,1063,1153, %T A166052 1201,1285,1301,1351,1423,1445,1495,1561,1621,1651,1699,1735,1873, %U A166052 1981,2125,2275,2281,2413,2545,2653,2683,3013,3301,3331,3385,3535 %N A166052 Second row of A166091. Positions of 3's in A166086. %Y A166052 See A166053. %K A166052 nonn %O A166052 1,1 %A A166052 _Antti Karttunen_, Oct 08 2009