id:A076399 - OEIS Search Results

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Number of prime factors of n-th perfect power (with repetition).

+0
3

0, 2, 3, 2, 4, 2, 3, 5, 4, 2, 6, 4, 4, 2, 3, 7, 6, 2, 4, 6, 4, 5, 8, 2, 6, 3, 2, 6, 4, 4, 9, 2, 8, 4, 4, 6, 6, 2, 6, 2, 6, 10, 4, 4, 4, 8, 3, 2, 4, 4, 8, 2, 9, 6, 2, 6, 6, 11, 4, 7, 3, 2, 10, 4, 6, 4, 6, 6, 2, 8, 4, 5, 8, 4, 4, 6, 2, 8, 2, 4, 6, 12, 4, 6, 2, 6, 4, 6, 3, 2, 10, 2, 4, 6, 6, 9, 4, 6, 2, 10, 8 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = A001222(A025478(n))*A025479(n).`
	LINKS	`Eric Weisstein's World of Mathematics, Perfect Powers.` `Eric Weisstein's World of Mathematics, Prime Factor.`
	FORMULA	`A001222(A001597(n)).`
	CROSSREFS	`Cf. A076398, A076400.` `Sequence in context: A080771 A025477 A080189 this_sequence A136529 A113982 A101743` `Adjacent sequences: A076396 A076397 A076398 this_sequence A076400 A076401 A076402`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Oct 09 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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