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 A139511 #4 Jun 19 2014 15:31:25
%S A139511 67,103,181,199,223,313,397,463,487,499,631,643,661,691,709,883,991,
%T A139511 1021,1039,1093,1153,1213,1321,1483,1543,1567,1741,1747,1753,1831,
%U A139511 1879,2017,2029,2083,2113,2137,2179,2203,2269,2311,2377,2539,2557,2677,2731
%N A139511 Primes of the form x^2 + 31x*y + y^2 for x and y nonnegative.
%H A139511 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)
%t A139511 a = {}; w = 31; k = 1; Do[Do[If[PrimeQ[n^2 + w*n*m + k*m^2], AppendTo[a, n^2 + w*n*m + k*m^2]], {n, m, 400}], {m, 1, 400}]; Union[a] (*Artur Jasinski*)
%Y A139511 Cf. A139489, A007645, A068228, A007519, A033212, A033212, A107152, A107008, A033215, A107145, A139490, A139491.
%K A139511 nonn
%O A139511 1,1
%A A139511 _Artur Jasinski_, Apr 24 2008