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A096445 Number of reduced primitive positive definite binary quadratic forms of determinant n^2. 2
1, 1, 2, 2, 2, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Equivalently, of discriminant -4n^2.

LINKS

Table of n, a(n) for n=1..7.

J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups, Springer-Verlag, 3rd edition, 1999, see Table 15.1.

CROSSREFS

Equals A096446(n^2). Cf. A006374.

Sequence in context: A228660 A228796 A155837 * A125915 A071472 A064135

Adjacent sequences:  A096442 A096443 A096444 * A096446 A096447 A096448

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 11 2004

STATUS

approved

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Last modified April 6 18:27 EDT 2020. Contains 333286 sequences. (Running on oeis4.)