id:A074722 - OEIS Search Results

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Sum_{d divides n} phi(n/d)*(-1)^bigomega(d).

+0
1

1, 0, 1, 2, 3, 0, 5, 2, 5, 0, 9, 2, 11, 0, 3, 6, 15, 0, 17, 6, 5, 0, 21, 2, 17, 0, 13, 10, 27, 0, 29, 10, 9, 0, 15, 10, 35, 0, 11, 6, 39, 0, 41, 18, 15, 0, 45, 6, 37, 0, 15, 22, 51, 0, 27, 10, 17, 0, 57, 6, 59, 0, 25, 22, 33, 0, 65, 30, 21, 0, 69, 10, 71, 0, 17, 34, 45, 0, 77, 18, 41, 0 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`Multiplicative with a(p^e) = 2(-1)^(e+1)((-p)^(e+1)-1)/(p+1)-p^e.`
	CROSSREFS	`Cf. A000010, A001222, A058026.` `Sequence in context: A071321 A071322 A072594 this_sequence A080368 A057174 A080367` `Adjacent sequences: A074719 A074720 A074721 this_sequence A074723 A074724 A074725`
	KEYWORD	`mult,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 27 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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