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 A139855 #22 Sep 08 2022 08:45:33
%S A139855 31,79,151,199,271,439,631,751,919,991,1039,1231,1279,1399,1471,1759,
%T A139855 1831,1879,1951,1999,2239,2311,2551,2671,2719,2791,3079,3271,3319,
%U A139855 3391,3511,3559,3631,3919,4111,4159,4231,4519,4591,4639,4759,4831
%N A139855 Primes of the form 4x^2+4xy+31y^2.
%C A139855 Discriminant = -480. See A139827 for more information.
%C A139855 Also primes of the form 15x^2+16y^2, which has discriminant = -960. - _T. D. Noe_, May 07 2008
%C A139855 Also primes of the form 16x^2+8xy+31y^2, which has discriminant = -1920. See A140633. - _T. D. Noe_, May 19 2008
%H A139855 Ray Chandler, <a href="/A139855/b139855.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]
%H A139855 William C. Jagy and Irving Kaplansky, <a href="/A244019/a244019.pdf">Positive definite binary quadratic forms that represent the same primes</a> [Cached copy] See item 14 in Table II.
%H A139855 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)
%F A139855 The primes are congruent to {31, 79} (mod 120).
%t A139855 QuadPrimes2[4, -4, 31, 10000] (* see A106856 *)
%o A139855 (Magma) [ p: p in PrimesUpTo(6000) | p mod 120 in {31, 79}]; // _Vincenzo Librandi_, Jul 29 2012
%K A139855 nonn,easy
%O A139855 1,1
%A A139855 _T. D. Noe_, May 02 2008