A006376 Number of indecomposable positive definite ternary quadratic forms of determinant n. (Formerly M0402)

0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 2, 3, 1, 2, 1, 3, 2, 1, 2, 5, 1, 1, 3, 5, 2, 3, 1, 5, 5, 2, 2, 6, 2, 2, 5, 6, 3, 3, 3, 8, 4, 3

Offset

1,19

References

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 398.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..50.

A. Schiemann, Brandt-Intrau tables recomputed

Crossrefs

Cf. A006377, A071136.

Sequence in context: A073058 A100336 A275609 * A005680 A036582 A260451

Adjacent sequences: A006373 A006374 A006375 * A006377 A006378 A006379

Keyword

nonn,nice,more

Author

N. J. A. Sloane

Status

approved