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

1,1

Links

Table of n, a(n) for n=1..56.

Crossrefs

Cf. A034017.

Sequence in context: A141037 A109424 A034019 * A320924 A357976 A330879

Adjacent sequences: A034015 A034016 A034017 * A034019 A034020 A034021

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

Extended by Ray Chandler, Jan 29 2009

Status

approved