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 A216578 #9 Sep 10 2012 12:36:48
%S A216578 2,3,5,7,13,17,23,29,31,37,43,47,53,61,67,71,73,79,83,97,101,103,107,
%T A216578 109,113,127,137,149,151,157,163,167,173,181,191,193,197,199,223,227,
%U A216578 229,233,239,257,263,269,271,277,283,293,307,311,313,317,337,347
%N A216578 Prime numbers which cannot be written in the form x^2 + 10*y^2.
%C A216578 Prime numbers not congruent to {1, 9, 11, 19} mod 40.
%Y A216578 Cf. A020673, A033201.
%K A216578 nonn
%O A216578 1,1
%A A216578 _V. Raman_, Sep 08 2012