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 A139831 #17 Sep 08 2022 08:45:33
%S A139831 2,23,47,83,107,167,227,263,347,383,443,467,503,563,587,647,683,743,
%T A139831 827,863,887,947,983,1103,1163,1187,1223,1283,1307,1367,1427,1487,
%U A139831 1523,1583,1607,1667,1787,1823,1847,1907,2003,2027,2063,2087,2207
%N A139831 Primes of the form 2x^2+2xy+23y^2.
%C A139831 Discriminant=-180. See A139827 for more information.
%C A139831 Except for 2, also primes of the forms 3x^2+20y^2 (A107169) and 8x^2+4xy+23y^2. See A140633. - _T. D. Noe_, May 19 2008
%H A139831 Vincenzo Librandi and Ray Chandler, <a href="/A139831/b139831.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]
%H A139831 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 A139831 Except for 2, the primes are congruent to {23, 47} (mod 60).
%t A139831 QuadPrimes2[2, -2, 23, 10000] (* see A106856 *)
%o A139831 (Magma) [2] cat[ p: p in PrimesUpTo(3000) | p mod 60 in {23, 47}]; // _Vincenzo Librandi_, Jul 29 2012
%K A139831 nonn,easy
%O A139831 1,1
%A A139831 _T. D. Noe_, May 02 2008