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

Offset: 1

Author

N. J. A. Sloane, Aug 11 2004

Keywords

• nonn
• more

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.