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 A215035 #5 Aug 05 2012 15:23:14 %S A215035 2,9,15,21,31,41,47,57,63,67,81,91,95,103,115,119,123,127,135,141,145, %T A215035 149,155,165,175,179,185,189,195,201,205,209,225,231,241,255,265,269, %U A215035 275,283,297,301,305,313,321,325,329,339,343,347,353,363,367,377,385,389,401,413,417,423,427,431,437,445,449,461,467,483,487,495,499,507,523,545,559,563 %N A215035 Numbers n such that A215029(n) = 2. %H A215035 StackExchange, <a href="http://math.stackexchange.com/questions/176394/a-prime-number-pattern">A prime number pattern</a>, Jul 29 2012. %Y A215035 A215031 is a subsequence. Cf. A215029-A215035. %K A215035 nonn %O A215035 1,1 %A A215035 _N. J. A. Sloane_, Aug 05 2012