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A020684 Numbers of form 4 x^2 + 9 y^2. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)