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 A139540 #2 Mar 31 2012 10:22:09 %S A139540 10,15,18,19,26,31,32,38,40,48,51,52,55,65,66,67,74,77,79,84,100,103, %T A139540 104,107,109,117,131,132,135,138,143,154,155,161,169,170,182,183,187, %U A139540 198,199,200,208,212,213,222,225,229,231,232,235,247,248,249,255,258 %N A139540 Indices of primes of the form 12k+1 which have representation x^2+32xy+y^2. %Y A139540 Cf. A068228, A139512, A139539. %K A139540 nonn %O A139540 1,1 %A A139540 _Artur Jasinski_, Apr 25 2008