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A243656
Positive integers primitively represented by x^2+3xy-y^2.
1
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
PROG
(C++) // Will Jagy's C++ program Conway_Positive_Primitive (see A243655 for source code).
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 11 2014
STATUS
approved