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 A139844 #19 Sep 08 2022 08:45:33
%S A139844 2,53,113,137,197,233,317,557,617,653,953,977,1373,1493,1733,1877,
%T A139844 1913,1997,2153,2213,2237,2297,2333,2417,2633,2657,2753,2837,3137,
%U A139844 3257,3413,3557,3593,3677,3833,3917,4013,4253,4337,4397,4517,4673
%N A139844 Primes of the form 2x^2 + 2xy + 53y^2.
%C A139844 Discriminant = -420. See A139827 for more information.
%H A139844 Vincenzo Librandi and Ray Chandler, <a href="/A139844/b139844.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]
%H A139844 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 A139844 The primes are congruent to {2, 53, 113, 137, 197, 233, 317} (mod 420).
%t A139844 QuadPrimes2[2, -2, 53, 10000] (* see A106856 *)
%o A139844 (Magma) [ p: p in PrimesUpTo(5000) | p mod 420 in {2, 53, 113, 137, 197, 233, 317}]; // _Vincenzo Librandi_, Jul 29 2012
%K A139844 nonn,easy
%O A139844 1,1
%A A139844 _T. D. Noe_, May 02 2008