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 A309139 #10 Aug 22 2019 08:04:29 %S A309139 3,13,41,71,127,139,179,257,269,311,331,409,439,443,461,541,587,673, %T A309139 739,761,823,887,967,1051,1061,1087,1129,1153,1223,1237,1277,1373, %U A309139 1381,1409,1427,1439,1567,1619,1733,1741,1783,1933,1973,2017,2063,2083,2203,2239,2417 %N A309139 Primes of the form 3*x^2 + 2*x*y + 8*y^2. %C A309139 Primes in A028960. %C A309139 Discriminant of positive definite binary quadratic form: -92. %H A309139 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a> %H A309139 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) %Y A309139 Cf. A028960. Subsequence of A106866. %K A309139 nonn %O A309139 1,1 %A A309139 _Hugo Pfoertner_, Jul 14 2019