A139640 Numbers of the form of 4x^2 - 4xy + 7y^2 (=24k+7) but not of the form 4x^2 + 4xy + 7y^2.

151, 487, 727, 751, 1039, 1063, 1399, 1471, 1759, 1783, 2287, 2647, 2671, 2767, 3343, 3463, 3919, 4111, 4423, 4663, 4903, 4999, 5167, 5407, 5791, 6607, 6703, 6823, 7159, 7351, 7639, 7879, 8191, 8263, 8311, 8839, 9127, 9151, 9439, 9967, 10111, 10711

Offset

1,1

Comments

Numbers which occur in A107006 but not in A107005.

Links

Table of n, a(n) for n=1..42.

Crossrefs

Cf. A107005, A107006.

Sequence in context: A142506 A164622 A176138 * A334836 A130870 A340436

Adjacent sequences: A139637 A139638 A139639 * A139641 A139642 A139643

Keyword

nonn

Author

Artur Jasinski, Apr 28 2008

Extensions

More terms from T. D. Noe, May 01 2008

Status

approved