OFFSET
1,2
COMMENTS
Discriminant 56.
Nonnegative integers of the form 7x^2 - 2y^2. - Jon E. Schoenfield, Jun 03 2022
LINKS
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[-1*x^2 + 6*x*y + 5*y^2 == n, {x, y}, Integers] =!= False, Sow[n]]]][[2, 1]]
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 05 2014
STATUS
approved