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A006376
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Number of indecomposable positive definite ternary quadratic forms of determinant n.
(Formerly M0402)
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1
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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;
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listen;
history;
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internal format)
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OFFSET
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1,19
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REFERENCES
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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).
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LINKS
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Table of n, a(n) for n=1..50.
A. Schiemann, Brandt-Intrau tables recomputed
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CROSSREFS
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Cf. A006377, A071136.
Sequence in context: A073058 A100336 A275609 * A005680 A036582 A260451
Adjacent sequences: A006373 A006374 A006375 * A006377 A006378 A006379
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KEYWORD
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nonn,nice,more
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AUTHOR
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N. J. A. Sloane
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STATUS
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approved
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