A028929 Numbers represented by quadratic form with Gram matrix [ 4, 1; 1, 6 ], divided by 2.

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

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 * A308299 A356940 A274452

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