id:A051378 - OEIS Search Results

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Sum of (1+e)-divisors of n: if x = Product p(i)^r(i) then (1+e)-sigma(x) = Product (Sum p(i)^s(i), s(i) = 0 or s(i) divides r(i)).

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1, 3, 4, 7, 6, 12, 8, 11, 13, 18, 12, 28, 14, 24, 24, 23, 18, 39, 20, 42, 32, 36, 24, 44, 31, 42, 31, 56, 30, 72, 32, 35, 48, 54, 48, 91, 38, 60, 56, 66, 42, 96, 44, 84, 78, 72, 48, 92, 57, 93, 72, 98, 54, 93, 72, 88, 80, 90, 60, 168, 62, 96, 104, 79, 84, 144, 68, 126, 96 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Multiplicative with a(p^e) = 1+Sum_{d\|e} p^d. - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 23 2002`
	CROSSREFS	`Cf. A051377, A049599.` `Sequence in context: A073185 A073183 A049418 this_sequence A116607 A107749 A093811` `Adjacent sequences: A051375 A051376 A051377 this_sequence A051379 A051380 A051381`
	KEYWORD	`nonn,easy,nice,mult`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)`
	EXTENSIONS	`Corrected and extended by Naohiro Nomoto (6284968128(AT)geocities.co.jp), Apr 12 2001`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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