id:A066088 - OEIS Search Results

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Number of distinct prime factors of Sigma2[n]=A001157(n), the sum of squares of divisors of n.

+0
2

0, 1, 2, 2, 2, 2, 2, 2, 2, 3, 2, 4, 3, 2, 3, 2, 3, 3, 2, 4, 2, 3, 3, 3, 3, 3, 3, 4, 2, 3, 3, 4, 3, 3, 3, 3, 3, 3, 3, 4, 2, 2, 3, 4, 3, 3, 4, 4, 3, 4, 3, 5, 3, 3, 3, 3, 3, 3, 2, 5, 2, 4, 4, 2, 4, 3, 3, 5, 3, 3, 2, 4, 4, 3, 5, 4, 3, 3, 2, 4, 2, 3, 4, 4, 4, 3, 3, 4, 3, 4, 3, 5, 4, 4, 3, 5, 3, 4, 4, 3, 2, 3, 3, 3, 3 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=A001221[A001157(n)]`
	EXAMPLE	`n=12, Sigma2[12]=144+36+16+9+4+1=210, so a(12)=4.`
	CROSSREFS	`A001221, A001157.` `Adjacent sequences: A066085 A066086 A066087 this_sequence A066089 A066090 A066091` `Sequence in context: A081412 A082863 A029411 this_sequence A139326 A029243 A109829`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 04 2001`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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