A039958 Class number of maximal order in real quadratic field of radicand n.

1, -1, 1, 2, -1, 1, 1, 2, 3, -2, 1, 2, -1, 1, 2, 4, -1, 3, 1, 2, 1, 1, 1, 2, 5, -2, 3, 2, -1, 2, 1, 4, 1, 2, 2, 6, -1, 1, 2, 2, -1, 2, 1, 2, 3, 1, 1, 4, 7, 5, 2, 2, -1, 3, 2, 2, 1, -2, 1, 2, -1, 1, 3, 8, -2, 2, 1, 2, 1, 2, 1, 6, -1, -2, 5, 2, 1, 2, 3, 4, 9, -4, 1, 2, -2, 1, 2, 2, -1, 3, 2, 2, 1, 1, 2, 4, -1, 7, 3, 10

Offset: 1

Author

R. K. Guy, N. J. A. Sloane

Keywords

• sign
• easy
• nice

Comments

Mollin gives a table for n < 10000.

References

• R. A. Mollin, Quadratics, CRC Press, 1996, Table C1.