A309135 Nonnegative integers of the form 9*x^2+7*x*y-5*y^2.

0, 3, 5, 9, 11, 12, 15, 17, 19, 20, 25, 27, 33, 36, 43, 44, 45, 48, 51, 55, 57, 60, 61, 68, 71, 75, 76, 80, 81, 83, 85, 95, 97, 99, 100, 103, 108, 111, 121, 125, 129, 132, 135, 144, 147, 149, 151, 153, 159, 165, 167, 171, 172, 176, 180, 181, 183, 185, 187, 192

Offset: 1

Author

Hugo Pfoertner, Jul 14 2019

Keywords

• nonn

Comments

Discriminant of indefinite binary quadratic form: 229.

Links

• Will Jagy, C++ program Conway_Positive_All.cc to find all positive numbers represented by an indefinite binary quadratic form
• 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: A141165.