A096446 - OEIS

A096446

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

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

(list; graph; refs; listen; history; text; internal format)

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.

KEYWORD

nonn,more

AUTHOR

STATUS

approved