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 A139659 #23 Sep 08 2022 08:45:33
%S A139659 373,421,457,613,757,1033,1381,1429,1453,1549,1597,1789,1801,2053,
%T A139659 2269,2293,2389,2473,2797,2857,3061,3109,3217,3229,3313,3469,3613,
%U A139659 3637,3697,3889,4201,4657,4813,4909,5653,5737,5881,6073,6133,6337
%N A139659 Primes of the form x^2 + 357*y^2.
%C A139659 Discriminant = -1428. See A139643 for more information.
%C A139659 The primes are congruent to {1, 25, 121, 169, 205, 253, 361, 373, 421, 457, 529, 613, 625, 757, 781, 841, 865, 961, 1033, 1045, 1177, 1345, 1369, 1381} (mod 1428).
%H A139659 Vincenzo Librandi and Ray Chandler, <a href="/A139659/b139659.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Vincenzo Librandi).
%H A139659 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 A139659 QuadPrimes2[1, 0, 357, 10000] (* see A106856 *)
%o A139659 (Magma) [ p: p in PrimesUpTo(7000) | p mod 1428 in {1, 25, 121, 169, 205, 253, 361, 373, 421, 457, 529, 613, 625, 757, 781, 841, 865, 961, 1033, 1045, 1177, 1345, 1369, 1381}]; // _Vincenzo Librandi_, Jul 29 2012
%o A139659 (Magma) k:=357; [p: p in PrimesUpTo(6400) | NormEquation(k, p) eq true]; // _Bruno Berselli_, Jun 01 2016
%K A139659 nonn,easy
%O A139659 1,1
%A A139659 _T. D. Noe_, Apr 29 2008