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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
OFFSET
1,3
COMMENTS
Equivalently, of discriminant -4n.
LINKS
J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups, Springer-Verlag, 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: A299484 A327007 A336767 * A274701 A184956 A340134
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Aug 11 2004
STATUS
approved