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A028929 Numbers represented by quadratic form with Gram matrix [ 4, 1; 1, 6 ], divided by 2. 5
0, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 24, 26, 27, 29, 31, 32, 36, 39, 41, 46, 47, 48, 50, 52, 54, 58, 62, 64, 69, 71, 72, 73, 75, 78, 81, 82, 87, 92, 93, 94, 96, 98, 100, 104, 108, 116, 117, 118, 123, 124, 127, 128, 131, 138, 139, 141, 142, 144, 146, 147, 150, 151, 156 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Nonnegative integers of the form 2x^2 + x*y + 3y^2, a positive definite quadratic form of discriminant -23. - N. J. A. Sloane, Jul 09 2014

LINKS

Table of n, a(n) for n=1..64.

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

CROSSREFS

For primes see A106867. Cf. A028958, A033217.

Sequence in context: A010407 A035240 A278580 * A274452 A018731 A232966

Adjacent sequences:  A028926 A028927 A028928 * A028930 A028931 A028932

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Corrected and extended by Larry Reeves (larryr(AT)acm.org), Mar 29 2000

STATUS

approved

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Last modified February 21 11:36 EST 2019. Contains 320372 sequences. (Running on oeis4.)