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 A139653 #21 Sep 08 2022 08:45:33
%S A139653 257,269,317,353,397,449,509,577,653,829,929,1013,1021,1061,1093,1153,
%T A139653 1181,1237,1277,1301,1373,1409,1453,1549,1637,1697,1741,1973,2017,
%U A139653 2237,2281,2293,2341,2377,2381,2473,2557,2677,2693,2753,2861,2953
%N A139653 Primes of the form x^2 + 253*y^2.
%C A139653 Discriminant=-1012. See A139643 for more information.
%C A139653 The primes are congruent to {1, 9, 25, 49, 81, 93, 133, 141, 169, 177, 185, 213, 225, 257, 265, 269, 289, 301, 317, 353, 357, 361, 377, 397, 441, 445, 449, 485, 489, 509, 533, 537, 553, 565, 577, 581, 625, 653, 669, 685, 729, 749, 785, 817, 829, 837, 841, 905, 929, 933, 949, 961, 969, 993, 1005} (mod 1012).
%H A139653 Vincenzo Librandi and Ray Chandler, <a href="/A139653/b139653.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Vincenzo Librandi).
%H A139653 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 A139653 QuadPrimes2[1, 0, 253, 10000] (* see A106856 *)
%o A139653 (Magma) k:=253; [p: p in PrimesUpTo(3000) | NormEquation(k, p) eq true]; // _Bruno Berselli_, Jun 01 2016
%K A139653 nonn,easy
%O A139653 1,1
%A A139653 _T. D. Noe_, Apr 29 2008