id:A074986 - OEIS Search Results

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Number of nonempty subsets of {1,2,3,...,n} that are closed under both GCD and LCM.

+0
2

1, 3, 5, 9, 11, 18, 20, 28, 32, 39, 41, 62, 64, 71, 78, 94, 96, 117, 119, 140, 147, 154, 156, 214, 218, 225, 233, 254, 256, 301, 303, 335, 342, 349, 356, 440, 442, 449, 456, 514, 516, 561, 563, 584, 605, 612, 614, 766, 770, 791, 798, 819, 821, 879, 886, 944, 951 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`I.e. number of division lattices with values from 1 to n. - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Sep 21 2006`
	CROSSREFS	`Cf. A051839, A122977, A122978.` `Sequence in context: A123069 A100456 A059819 this_sequence A123328 A091945 A034760` `Adjacent sequences: A074983 A074984 A074985 this_sequence A074987 A074988 A074989`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Oct 02 2002`
	EXTENSIONS	`More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Sep 21 2006`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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