id:A086288 - OEIS Search Results

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Number of distinct prime factors of 7-smooth numbers.

+0
3

0, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 1, 2, 3, 1, 2, 2, 2, 3, 2, 2, 1, 2, 2, 2, 3, 2, 1, 3, 2, 2, 2, 1, 3, 3, 2, 2, 2, 3, 2, 2, 3, 1, 3, 1, 2, 3, 2, 2, 3, 2, 2, 3, 2, 3, 2, 2, 2, 2, 4, 2, 2, 2, 3, 1, 2, 2, 3, 1, 3, 3, 2, 3, 3, 3, 2, 2, 3, 1, 3, 3, 2, 3, 2, 2, 2, 2, 4, 2, 2, 2, 3 (list; graph; listen)

	OFFSET	`1,6`
	COMMENT	`a(n) = A001221(A002473(n));` `a(n) <= 4.`
	CROSSREFS	`Cf. A086289, A086290.` `Sequence in context: A087742 A072530 A090455 this_sequence A104360 A079951 A095407` `Adjacent sequences: A086285 A086286 A086287 this_sequence A086289 A086290 A086291`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 15 2003`

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

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