A243169 Nonnegative integers of the form -x^2 + 6xy + 3y^2.

0, 3, 8, 11, 12, 23, 27, 32, 39, 44, 47, 48, 59, 71, 72, 75, 83, 92, 99, 104, 107, 108, 111, 128, 131, 143, 147, 156, 167, 176, 179, 183, 188, 191, 192, 200, 207, 219, 227, 236, 239, 243, 251, 263, 264, 275, 284, 288, 291, 296, 299, 300, 311, 327, 332, 347, 351, 359, 363, 368, 383, 392, 396, 407, 416, 419, 423, 428, 431, 432, 443, 444, 467, 471, 479, 488

Offset

1,2

Comments

Discriminant 48.

Nonnegative integers of the form 3x^2 - 4y^2. - Jon E. Schoenfield, Jun 03 2022

Links

Table of n, a(n) for n=1..76.

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

Crossrefs

Primes in this sequence = A141187.

Sequence in context: A310279 A310280 A020680 * A366582 A051245 A373831

Adjacent sequences: A243166 A243167 A243168 * A243170 A243171 A243172

Keyword

nonn

Author

N. J. A. Sloane, Jun 01 2014

Status

approved