id:A072211 - OEIS Search Results

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a(n) = p-1 if n=p, p if n=p^e and e<>1, 1 otherwise; p a prime.

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1, 1, 2, 2, 4, 1, 6, 2, 3, 1, 10, 1, 12, 1, 1, 2, 16, 1, 18, 1, 1, 1, 22, 1, 5, 1, 3, 1, 28, 1, 30, 2, 1, 1, 1, 1, 36, 1, 1, 1, 40, 1, 42, 1, 1, 1, 46, 1, 7, 1, 1, 1, 52, 1, 1, 1, 1, 1, 58, 1, 60, 1, 1, 2, 1, 1, 66, 1, 1, 1, 70, 1, 72, 1, 1, 1, 1, 1, 78, 1, 3, 1, 82, 1, 1, 1, 1, 1, 88, 1, 1, 1, 1, 1 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Product_{ d divides n } a(d) = phi(n).`
	FORMULA	`a(n) = Product_{ d divides n } phi(n/d)^mu(d). - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 08 2004`
	CROSSREFS	`Cf. A000010.` `Sequence in context: A027420 A116588 A069922 this_sequence A070306 A014665 A055035` `Adjacent sequences: A072208 A072209 A072210 this_sequence A072212 A072213 A072214`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 03 2002`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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