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 A024520 #3 Mar 30 2012 18:55:55 %S A024520 1,2,5,6,11,14,16,20,22,26,31,33,36,39,40,48,52,54,60,63,65,67,77,79, %T A024520 81,86,90,93,94,99,104,106,111,115,116,123,127,130,132,135,138,141, %U A024520 145,148,150,163,167,172,178,181,182,189,191,195,196 %N A024520 Positions of primes in A000404 (sums of 2 nonzero squares). %K A024520 nonn %O A024520 1,2 %A A024520 _Clark Kimberling_