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A096446
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Number of reduced primitive positive definite binary quadratic forms of determinant n.
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2
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1, 1, 2, 1, 2, 2, 2, 3, 2, 2, 4, 2
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OFFSET
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1,3
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COMMENTS
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Equivalently, of discriminant -4n.
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LINKS
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Table of n, a(n) for n=1..12.
J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups, Springer-Verlag, 3rd edition, 1999, see Table 15.1.
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CROSSREFS
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A096445(n) = a(n^2). A006374 gives the number if imprimitive forms are also included.
Sequence in context: A057368 A192394 A085033 * A184956 A218469 A008677
Adjacent sequences: A096443 A096444 A096445 * A096447 A096448 A096449
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Aug 11 2004
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STATUS
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approved
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