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 A106866 #21 Aug 22 2019 08:04:03 %S A106866 2,3,13,41,71,127,139,179,257,269,311,331,409,439,443,461,541,587,673, %T A106866 739,761,823,887,967,1051,1061,1087,1129,1153,1223,1237,1277,1373, %U A106866 1381,1409,1427,1439,1567,1619,1733,1741,1783,1933,1973,2017,2063 %N A106866 Primes of the form 2x^2+xy+3y^2, with x and y nonnegative. %C A106866 Discriminant=-23. %C A106866 For even x we generate A309139. - _R. J. Mathar_, Aug 22 2019 %H A106866 Vincenzo Librandi and Ray Chandler, <a href="/A106866/b106866.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A106866 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 A106866 QuadPrimes2[2, 1, 3, 10000] (* see A106856 *) %K A106866 nonn,easy %O A106866 1,1 %A A106866 _T. D. Noe_, May 09 2005