A243168 Nonnegative integers of the form x^2 + 6xy - 3y^2.

0, 1, 4, 9, 13, 16, 24, 25, 33, 36, 37, 49, 52, 61, 64, 69, 73, 81, 88, 96, 97, 100, 109, 117, 121, 132, 141, 144, 148, 157, 169, 177, 181, 184, 193, 196, 208, 213, 216, 225, 229, 241, 244, 249, 253, 256, 276, 277, 289, 292, 297, 312, 313, 321, 324, 325, 333, 337, 349, 352, 361, 373, 376, 384, 388, 393, 397, 400, 409, 421, 429, 433, 436, 441, 457, 468, 472

Offset: 1

Author

N. J. A. Sloane, Jun 01 2014

Keywords

• nonn

Comments

Discriminant 48.

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

Links

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

Crossrefs

Primes in this sequence = A068228. Cf. A085018, A244291.