id:A156061 - OEIS Search Results

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a(n) = product of ranks of distinct prime factors of n; where Rank(2)=1, ..., rank(prime_i)=i.

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1, 2, 1, 3, 2, 4, 1, 2, 3, 5, 2, 6, 4, 6, 1, 7, 2, 8, 3, 8, 5, 9, 2, 3, 6, 2 (list; graph; listen)

	OFFSET	`2,2`
	EXAMPLE	`n=14 = 2 * 7. rank(14)= rank(2)rank(7)= 14 = 4. n=168 = 2^3 * 3 * 7. rank(168)= rank(2)rank(3)rank(7) = 124 = 8.`
	CROSSREFS	`Cf. A007947, A000040` `Sequence in context: A035491 A108230 A061395 this_sequence A124172 A058933 A087470` `Adjacent sequences: A156058 A156059 A156060 this_sequence A156062 A156063 A156064`
	KEYWORD	`nonn`
	AUTHOR	`Ctibor O. Zizka (c.zizka(AT)email.cz), Feb 03 2009`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.