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