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A039958 Class number of maximal order in real quadratic field of radicand n. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

REFERENCES

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

LINKS

Table of n, a(n) for n=1..100.

CROSSREFS

Sequence in context: A126863 A106806 A178526 * A029344 A316854 A125769

Adjacent sequences:  A039955 A039956 A039957 * A039959 A039960 A039961

KEYWORD

sign,easy,nice

AUTHOR

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

EXTENSIONS

Mollin gives a table for n < 10000.

STATUS

approved

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Last modified February 24 01:03 EST 2020. Contains 332195 sequences. (Running on oeis4.)