A005474 - OEIS

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A005474

Class numbers of quadratic fields.
(Formerly M2215)

1, 1, 1, 1, 1, 3, 1, 3, 5, 3, 3, 7, 3, 5, 7, 3, 3, 5, 9, 7, 3, 5, 5, 15, 9, 19, 5, 13, 9, 9, 5, 19, 9, 5, 7, 15, 13, 9, 9, 15, 25, 13, 9, 27, 19, 15, 21, 7, 13, 11, 23, 9, 13, 13, 11, 33, 15, 25, 23, 15, 13 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,6`
	REFERENCES	`D. Shanks, The simplest cubic fields, Math. Comp., 28 (1974), 1137-1152.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	LINKS	`Index entries for sequences related to quadratic fields`
	CROSSREFS	`Sequence in context: A134231 A126637 A110091 * A012264 A063198 A122582` `Adjacent sequences: A005471 A005472 A005473 * A005475 A005476 A005477`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 07:42 EST 2012. Contains 205717 sequences.