id:A076398 - OEIS Search Results

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Number of distinct prime factors of n-th perfect power.

+0
3

0, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 2, 1, 1, 1, 2, 1, 1, 2, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 1, 2, 3, 1, 2, 2, 1, 2, 1, 1, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 2, 1, 3, 1, 2, 2, 1, 2, 3, 1, 2, 2, 3, 1, 1, 2, 1, 2, 2, 2, 2, 2, 3, 1, 2, 1, 2, 1, 1, 3 (list; graph; listen)

	OFFSET	`1,9`
	COMMENT	`a(n) = A001221(A025478(n)).`
	LINKS	`Eric Weisstein's World of Mathematics, Perfect Powers.` `Eric Weisstein's World of Mathematics, Distinct Prime Factors.`
	FORMULA	`A001221(A001597(n)).`
	CROSSREFS	`Cf. A076399, A076400.` `Sequence in context: A118663 A102097 A050330 this_sequence A086257 A161098 A136177` `Adjacent sequences: A076395 A076396 A076397 this_sequence A076399 A076400 A076401`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 09 2002`

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.

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