A020684 Numbers of form 4 x^2 + 9 y^2.

0, 4, 9, 13, 16, 25, 36, 40, 45, 52, 64, 72, 73, 81, 85, 97, 100, 109, 117, 136, 144, 145, 148, 153, 160, 180, 181, 196, 205, 208, 225, 229, 232, 241, 244, 256, 261, 265, 277, 288, 289, 292, 324, 325, 328, 333, 337, 340, 360, 369, 388, 400, 405, 409, 421, 424, 436, 441

Offset

1,2

Links

Table of n, a(n) for n=1..58.

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

Crossrefs

Sequence in context: A312886 A010397 A155563 * A312887 A312888 A312889

Adjacent sequences: A020681 A020682 A020683 * A020685 A020686 A020687

Keyword

easy,nonn

Author

David W. Wilson

Status

approved