id:A007978 - OEIS Search Results

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Least non-divisor of n.

+0
7

2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 7, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 4, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Least k >= 2 such that sigma(n) divides sigma(n*k) - Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 01 2002`
	FORMULA	`a(n) = A053669(n) + A061853(n) = A055874(n) + 1. - Henry Bottomley (se16(AT)btinternet.com), May 10 2001`
	CROSSREFS	`Sequence in context: A073820 A103509 A069898 this_sequence A096737 A029208 A087242` `Adjacent sequences: A007975 A007976 A007977 this_sequence A007979 A007980 A007981`
	KEYWORD	`nonn`
	AUTHOR	`Jeffrey Shallit (shallit(AT)graceland.uwaterloo.ca)`

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Last modified December 4 12:27 EST 2008. Contains 151280 sequences.

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