id:A078120 - OEIS Search Results

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Number of distinct prime divisors of n-th balanced number.

+0
1

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

	OFFSET	`1,4`
	FORMULA	`a(n)=A001221[A020492(n)]`
	EXAMPLE	`575th balanced number is 2089542=2.3.7.13.43.89, a[575]=6, and sigma[2089542]/phi[2089542]=10.`
	CROSSREFS	`Cf. A020492, A001221.` `Sequence in context: A081309 A010553 A108502 this_sequence A057525 A139325 A068211` `Adjacent sequences: A078117 A078118 A078119 this_sequence A078121 A078122 A078123`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 06 2002`

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Last modified August 27 20:51 EDT 2008. Contains 143094 sequences.

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