A309138 Nonnegative integers of the form x^2 + 23*y^2.

0, 1, 4, 9, 16, 23, 24, 25, 27, 32, 36, 39, 48, 49, 59, 64, 72, 81, 87, 92, 93, 96, 100, 101, 104, 108, 117, 121, 123, 128, 141, 144, 156, 167, 169, 173, 192, 196, 207, 208, 211, 213, 216, 219, 223, 225, 232, 236, 243, 248, 256, 261, 271, 279, 288, 289, 307, 312

Offset

1,3

Comments

Discriminant of positive definite binary quadratic form: -92.

Links

Table of n, a(n) for n=1..58.

Peter Luschny, Binary Quadratic Forms

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

Crossrefs

Primes in this sequence: A033217.

Cf. A028958.

Sequence in context: A152399 A022822 A001639 * A162207 A092614 A313351

Adjacent sequences: A309135 A309136 A309137 * A309139 A309140 A309141

Keyword

nonn

Author

Hugo Pfoertner, Jul 14 2019

Status

approved