login
A020691
Numbers of form 7 x^2 + 9 y^2.
1
0, 7, 9, 16, 28, 36, 37, 43, 63, 64, 72, 81, 88, 99, 109, 112, 121, 144, 148, 151, 172, 175, 184, 193, 207, 211, 225, 232, 252, 253, 256, 261, 288, 319, 324, 331, 333, 337, 343, 352, 379, 387, 396, 400, 424, 436, 441, 448, 457, 469, 477, 484, 487, 499, 504, 529, 553, 567
OFFSET
1,2
LINKS
N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)
MATHEMATICA
Take[Union[7#[[1]]+9#[[2]]&/@Tuples[Range[0, 20]^2, 2]], 60] (* Harvey P. Dale, Aug 22 2014 *)
CROSSREFS
Sequence in context: A371303 A249333 A372934 * A366674 A145830 A195563
KEYWORD
easy,nonn
STATUS
approved