id:A049087 - OEIS Search Results

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Ceiling of mean distance between successive distinct prime divisors of n.

+0
1

0, 0, 0, 0, 0, 1, 0, 0, 0, 3, 0, 1, 0, 5, 2, 0, 0, 1, 0, 3, 4, 9, 0, 1, 0, 11, 0, 5, 0, 2, 0, 0, 8, 15, 2, 1, 0, 17, 10, 3, 0, 3, 0, 9, 2, 21, 0, 1, 0, 3, 14, 11, 0, 1, 6, 5, 16, 27, 0, 2, 0, 29, 4, 0, 8, 5, 0, 15, 20, 3, 0, 1, 0, 35, 2, 17, 4, 6, 0, 3, 0, 39, 0, 3, 12, 41, 26, 9, 0, 2, 6, 21, 28, 45 (list; graph; listen)

	OFFSET	`1,10`
	EXAMPLE	`a(105)=2: prime divisors of 105 are 3,5,7; distance between successive pairs: 5-3=2 and 7-5=2; mean of 2 and 2 is 2. If n=30 the mean is 1.5 and rounding up, a(30)=2.`
	CROSSREFS	`Sequence in context: A035695 A100257 A100573 this_sequence A046665 A100574 A056100` `Adjacent sequences: A049084 A049085 A049086 this_sequence A049088 A049089 A049090`
	KEYWORD	`easy,nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research