A123065 Numbers primitively represented by the quadratic form 2 x^2 + xy + 4 y^2.

2, 4, 5, 7, 10, 14, 16, 19, 20, 25, 28, 32

Offset

1,1

References

J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 82.

Links

Table of n, a(n) for n=1..12.

Crossrefs

Cf. A123063, A123064, A123067, A123068.

Sequence in context: A223729 A190235 A023181 * A115334 A167792 A035547

Adjacent sequences: A123062 A123063 A123064 * A123066 A123067 A123068

Keyword

nonn

Author

N. J. A. Sloane, Sep 27 2006

Status

approved