A081863 - OEIS

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A081863

Largest integer m such that m divides (sigma_(2n+1)(2k-1)-sigma(2k-1)) for all k>=1.

24, 240, 168, 480, 264, 21840, 24, 16320, 3192, 2640, 552, 21840, 24 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n)==0 mod 24. It seems that a(n)==0 (mod 2n+1) if and only if 2n+1 is an odd prime.`
	CROSSREFS	`Cf. A000203.` `Sequence in context: A193168 A190020 A159506 * A003264 A003272 A003245` `Adjacent sequences: A081860 A081861 A081862 * A081864 A081865 A081866`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 12 2003`

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Last modified February 16 11:30 EST 2012. Contains 205907 sequences.