A112753 - OEIS

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A112753

Number of distinct prime factors of n-th number of the form 3^i*5^j.

0, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,5`
	COMMENTS	`a(n) = A001221(A003593(n)) = 2 - 0^A022336(n) + 0^A022337(n);` `a(n) <= 2.`
	LINKS	`Table of n, a(n) for n=1..105.`
	CROSSREFS	`Cf. A112754, A112758, A086412.` `Sequence in context: A088978 A160245 A154351 * A023589 A134034 A174886` `Adjacent sequences: A112750 A112751 A112752 * A112754 A112755 A112756`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller, Sep 18 2005`
	STATUS	`approved`

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Last modified May 22 08:33 EDT 2013. Contains 225513 sequences.