

A096446


Number of reduced primitive positive definite binary quadratic forms of determinant n.


2



1, 1, 2, 1, 2, 2, 2, 3, 2, 2, 4, 2
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OFFSET

1,3


COMMENTS

Equivalently, of discriminant 4n.


LINKS

Table of n, a(n) for n=1..12.
J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups, SpringerVerlag, 3rd edition, 1999, see Table 15.1.


CROSSREFS

A096445(n) = a(n^2). A006374 gives the number if imprimitive forms are also included.
Sequence in context: A192394 A085033 A230254 * A274701 A184956 A218469
Adjacent sequences: A096443 A096444 A096445 * A096447 A096448 A096449


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Aug 11 2004


STATUS

approved



