id:A014599 - OEIS Search Results

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Class numbers h(D) of imaginary quadratic fields with discriminant D=1-4*n.

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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; listen)

	OFFSET	`1,4`
	REFERENCES	`H. Cohen, Course in Computational Alg. No. Theory, Springer, 1993, pp. 514-5.`
	PROGRAM	`(PARI) a(n) = qfbclassno(1-4*n)`
	CROSSREFS	`Sequence in context: A038569 A020650 A124224 this_sequence A075825 A007735 A002616` `Adjacent sequences: A014596 A014597 A014598 this_sequence A014600 A014601 A014602`
	KEYWORD	`nonn`
	AUTHOR	`Eric Rains (rains(AT)caltech.edu)`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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