A071136 Number of reduced positive-definite ternary forms of determinant -n.

1, 1, 2, 2, 2, 2, 3, 4, 4, 3, 3, 6, 4, 3, 6, 7, 4, 6, 5, 8, 7, 4, 5, 10, 6, 5, 9, 9, 5, 7, 7, 12, 9, 6, 9, 14, 7, 6, 10, 14, 7, 9, 8, 13, 15, 6, 9, 20, 9, 10, 11, 13, 8, 11, 13, 16, 12, 8, 10, 22, 10, 8, 19, 17, 12, 12, 11, 17, 14, 12, 11, 28, 12, 9, 19, 18, 14, 12, 12, 28, 16

Offset

1,3

Links

Table of n, a(n) for n=1..81.

G. Eisenstein, Tabelle der reducirten positiven ternären quadratischen Formen..., Crelle 41 (1851), 141-190 and 227-242; Ges. Werke II, 637-702.

A. Schiemann, Brandt-Intrau tables recomputed.

Crossrefs

Cf. A006376, A006377.

Sequence in context: A230230 A187821 A114775 * A025425 A234451 A085501

Adjacent sequences: A071133 A071134 A071135 * A071137 A071138 A071139

Keyword

nonn,nice

Author

N. J. A. Sloane, Jun 20 2002

Status

approved