A243165 Nonnegative integers of the form 2x^2 + 4xy - 3y^2.

0, 2, 3, 5, 8, 12, 13, 18, 20, 27, 30, 32, 37, 43, 45, 48, 50, 52, 53, 62, 67, 72, 75, 78, 80, 82, 83, 93, 98, 107, 108, 117, 120, 123, 125, 128, 130, 142, 147, 148, 155, 157, 158, 162, 163, 172, 173, 178, 180, 192, 195, 197, 200, 205, 208, 212, 213, 222, 227, 237, 242, 243, 245, 248, 258, 267, 268, 270, 277, 283

Offset

1,2

Comments

Discriminant 40.

From Jon E. Schoenfield, Jun 03 2022: (Start)

Also nonnegative integers of the form 5x^2 - 2y^2.

Also nonnegative integers of the form 2x^2 - 5y^2. (End)

Links

Table of n, a(n) for n=1..70.

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

Crossrefs

Primes in this sequence = A141179.

Sequence in context: A287006 A020899 A057987 * A336993 A176746 A067288

Adjacent sequences: A243162 A243163 A243164 * A243166 A243167 A243168

Keyword

nonn

Author

N. J. A. Sloane, May 31 2014

Status

approved