A242655 - OEIS

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A242655

Numbers of the form 2x^2+2xy+3y^2 with x and y nonnegative.

0

0, 2, 3, 7, 8, 12, 15, 18, 27, 28, 32, 35, 42, 43, 47, 48, 50, 58, 60, 63, 72, 75, 82, 83, 87, 90, 98, 103, 107, 108, 112, 115, 122, 123, 128, 135, 138, 140, 147, 162, 163, 167, 168, 172, 175, 183, 188, 192, 200, 202, 203, 207, 210, 218, 223, 232, 235, 240, 242, 243, 252, 258, 263, 267, 282, 283, 287, 288, 290, 298, 300

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Discriminant = -20.

LINKS

Table of n, a(n) for n=1..71.

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

CROSSREFS

For primes see A106864. Cf. A029718, A106865.

Sequence in context: A281017 A281018 A184860 * A145489 A003307 A105601

Adjacent sequences: A242652 A242653 A242654 * A242656 A242657 A242658

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 30 2014

STATUS

approved