OFFSET
1,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..9600
N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)
MATHEMATICA
lim=300; k=9; Union@Flatten@Table[x^2 + k y^2, {y, 0, Sqrt[lim/k]}, {x, 0, Sqrt[lim-k y^2]}] (* Vincenzo Librandi, Aug 31 2016 *)
PROG
(Magma) [n: n in [0..300] | NormEquation(9, n) eq true]; // Vincenzo Librandi, Aug 31 2016
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
STATUS
approved