A034018 Numbers that are represented by x^2+xy+y^2 but not primitively.

4, 9, 12, 16, 25, 27, 28, 36, 48, 52, 63, 64, 75, 76, 81, 84, 100, 108, 112, 117, 121, 124, 144, 148, 156, 171, 172, 175, 189, 192, 196, 208, 225, 228, 243, 244, 252, 256, 268, 279, 289, 292, 300, 304, 316, 324, 325, 333, 336, 351, 363, 364, 372, 387, 388, 400

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Crossrefs

Cf. A034017.

Extensions

Extended by Ray Chandler, Jan 29 2009