id:A068970 - OEIS Search Results

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Sum(phi(d^4)); d|n.

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1, 9, 55, 137, 501, 495, 2059, 2185, 4429, 4509, 13311, 7535, 26365, 18531, 27555, 34953, 78609, 39861, 123463, 68637, 113245, 119799, 267675, 120175, 313001, 237285, 358723, 282083, 682893, 247995, 893731, 559241, 732105, 707481 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Also Sum( d\|n, d^m*phi(d^(4-m))) for m=0, 1, 2, 3` `Multiplicative with a(p^e) = 1 + p^3 + (p-1)(p^(4e)-1)/(p^4-1)`
	CROSSREFS	`Adjacent sequences: A068967 A068968 A068969 this_sequence A068971 A068972 A068973` `Sequence in context: A093847 A058849 A058852 this_sequence A141530 A016269 A005770`
	KEYWORD	`easy,nonn,mult`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2002`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

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