id:A058008 - OEIS Search Results

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Numbers n such that GCD[2n,C(2n,n)]=2n.

+0
4

1, 6, 15, 28, 42, 45, 66, 77, 91, 110, 126, 140, 153, 156, 170, 187, 190, 204, 209, 210, 220, 228, 231, 238, 266, 276, 299, 308, 312, 315, 322, 325, 330, 345, 378, 414, 420, 429, 435, 440, 442, 450, 459, 460, 468, 476, 483, 493, 496 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Observe also that GCD[2n,C(2n,n)]=2 holds for n=prime powers (i.e.A000961).` `Also, positions where A075055 differs from A000984. - Ralf Stephan, Dec 11 2004`
	FORMULA	`Appears to be A067348(n)/2. - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 21 2003`
	CROSSREFS	`A001405, A000961.` `Sequence in context: A161777 A117519 A091012 this_sequence A094142 A081873 A096892` `Adjacent sequences: A058005 A058006 A058007 this_sequence A058009 A058010 A058011`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 13 2000`

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Last modified November 23 10:40 EST 2009. Contains 167421 sequences.

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