%N Numbers of form 2x^2 + 2xy + 3y^2.
%C Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 3 ].
%D H. Cohn, A second course in number theory, John Wiley & Sons, Inc., New York-London, 1962. see page 3.
%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)
%F List contains 0 and all positive n such that 2*A035170(n) = A028586(n) is nonzero. - _Michael Somos_, Oct 21 2006
%Y Cf. A028927.
%Y For primes see A106865.
%Y For the properly represented numbers see A344232.
%A _N. J. A. Sloane_
%E More terms from Larry Reeves (larryr(AT)acm.org), Mar 29 2000