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A014599 Class numbers h(D) of imaginary quadratic fields with discriminant D=1-4*n. 0
1, 1, 1, 2, 1, 3, 1, 3, 2, 4, 1, 5, 2, 4, 3, 4, 1, 7, 2, 5, 3, 6, 2, 8, 2, 5, 3, 8, 2, 10, 2, 5, 5, 6, 3, 10, 2, 7, 4, 10, 1, 11, 4, 6, 5, 8, 2, 13, 4, 9, 4, 6, 3, 14, 4, 7, 5, 12, 2, 15, 3, 6, 7, 12, 4, 13, 2, 11, 4, 12, 3, 14, 4, 8, 8, 10, 3, 19, 4, 10, 4, 12, 3, 18, 6, 7, 5, 12, 4, 19 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

REFERENCES

H. Cohen, Course in Computational Alg. No. Theory, Springer, 1993, pp. 514-5.

PROG

(PARI) a(n) = qfbclassno(1-4*n)

CROSSREFS

Sequence in context: A038569 A020650 A124224 * A075825 A007735 A002616

Adjacent sequences:  A014596 A014597 A014598 * A014600 A014601 A014602

KEYWORD

nonn

AUTHOR

Eric Rains (rains(AT)caltech.edu)

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Last modified February 14 17:10 EST 2012. Contains 205644 sequences.