OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)
MATHEMATICA
With[{upto = 350}, Select[Union[2#[[1]]^2 + 9#[[2]]^2&/@Tuples[Range[0, Ceiling[Sqrt[upto^2/2]]], 2]], # <= upto &]] (* Harvey P. Dale, May 30 2017 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
STATUS
approved