id:A088737 - OEIS Search Results

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Number of semiprime divisors of n-th composite number.

+0
2

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

	OFFSET	`1,6`
	FORMULA	`a(n) = A056170(n) + A001221(n)*(A001221(n)-1)/2.`
	CROSSREFS	`Cf. A088738, A002808, A001358.` `Sequence in context: A037306 A007424 A085424 this_sequence A096309 A049419 A046951` `Adjacent sequences: A088734 A088735 A088736 this_sequence A088738 A088739 A088740`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Oct 12 2003`

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

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