id:A107759 - OEIS Search Results

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(+2)UnitarySigma(n) : If n=Product p_i^r_i then (+2)Sigma(n)=Product (2+p_i^r_i), (+2)UnitarySigma(1)=1.

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1, 4, 5, 6, 7, 20, 9, 10, 11, 28, 13, 30, 15, 36, 35, 18, 19, 44, 21, 42 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`(+2)UnitarySigma(12)=(2+3)*(2+4)=30.`
	CROSSREFS	`Cf. A107758, A054862.` `Sequence in context: A046300 A053738 A154787 this_sequence A161627 A030667 A030677` `Adjacent sequences: A107756 A107757 A107758 this_sequence A107760 A107761 A107762`
	KEYWORD	`nonn,mult`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), May 25 2005`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.