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Primes of the form 3*x^2 + 2*x*y + 8*y^2.
1

%I #10 Aug 22 2019 08:04:29

%S 3,13,41,71,127,139,179,257,269,311,331,409,439,443,461,541,587,673,

%T 739,761,823,887,967,1051,1061,1087,1129,1153,1223,1237,1277,1373,

%U 1381,1409,1427,1439,1567,1619,1733,1741,1783,1933,1973,2017,2063,2083,2203,2239,2417

%N Primes of the form 3*x^2 + 2*x*y + 8*y^2.

%C Primes in A028960.

%C Discriminant of positive definite binary quadratic form: -92.

%H Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a>

%H 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 Cf. A028960. Subsequence of A106866.

%K nonn

%O 1,1

%A _Hugo Pfoertner_, Jul 14 2019