A243656 Positive integers primitively represented by x^2+3xy-y^2.

1, 3, 9, 13, 17, 23, 27, 29, 39, 43, 51, 53, 61, 69, 79, 81, 87, 101, 103, 107, 113, 117, 127, 129, 131, 139, 153, 157, 159, 173, 179, 181, 183, 191, 199, 207, 211, 221, 233, 237, 243, 251, 257, 261, 263, 269, 277, 283, 289, 299, 303, 309

Offset

1,2

Links

Table of n, a(n) for n=1..52.

Prog

(C++) // Will Jagy's C++ program Conway_Positive_Primitive (see A243655 for source code).

Crossrefs

Cf. A035256, A243656, A243655.

Sequence in context: A176393 A345460 A239320 * A363406 A240108 A163595

Adjacent sequences: A243653 A243654 A243655 * A243657 A243658 A243659

Keyword

nonn

Author

N. J. A. Sloane, Jun 11 2014

Status

approved