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A006376 Number of indecomposable positive definite ternary quadratic forms of determinant n.
(Formerly M0402)
1
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 (list; graph; refs; listen; history; text; internal format)
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

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 16 17:49 EDT 2019. Contains 328102 sequences. (Running on oeis4.)