A060428 Numbers of form x^2 + xy + y^2 (with repetitions if more than one representation is possible).

1, 3, 4, 7, 9, 12, 13, 16, 19, 21, 25, 27, 28, 31, 36, 37, 39, 43, 48, 49, 49, 52, 57, 61, 63, 64, 67, 73, 75, 76, 79, 81, 84, 91, 91, 93, 97, 100, 103, 108, 109, 111, 112, 117, 121, 124, 127, 129, 133, 133, 139, 144, 147, 147, 148, 151, 156, 157, 163, 169, 169, 171

Offset: 1

Author

Anton Sherwood (bronto(AT)pobox.com), Apr 05 2001

Keywords

• nonn

Crossrefs

See A003136, which is the main entry for these numbers.