OFFSET
1,2
COMMENTS
Discriminant 33.
LINKS
R. J. Mathar, Table of n, a(n) for n = 1..1562
N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)
MATHEMATICA
Reap[For[n = 0, n <= 300, n++, If[Reduce[2*x^2 + 3*x*y - 3*y^2 == n, {x, y}, Integers] =!= False, Sow[n]]]][[2, 1]] (* In older versions, this program used to miss out 0 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 04 2014
STATUS
approved