id:A129568 - OEIS Search Results

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a(n) = number of positive divisors of the numerator of the n-th harmonic number H(n) = sum{k=1 to n} 1/k.

+0
2

1, 2, 2, 3, 2, 3, 6, 2, 2, 6, 4, 6, 8, 4, 4, 6, 4, 6, 4, 4, 2, 24, 4, 8, 4, 2, 8, 6, 6, 24, 4, 8, 4, 4, 4, 24, 4, 16, 4, 12, 2, 12, 8, 16, 8, 12, 16, 8, 4, 8, 8, 24, 4, 8, 4, 2, 8, 24, 4, 12, 4, 2, 16, 16, 16, 48, 16, 4, 2, 12, 16, 12, 8, 8, 16, 16, 32, 12, 2, 16, 8, 6, 16, 16, 8, 8, 16, 24, 2 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = A000005(A001008(n)).`
	MAPLE	`with(numtheory): H:=n->sum(1/k, k=1..n): a:=n->tau(numer(H(n))): seq(a(n), n=1..89); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 04 2007`
	CROSSREFS	`Cf. A001008, A129567.` `Sequence in context: A126225 A056160 A106245 this_sequence A117122 A122828 A035213` `Adjacent sequences: A129565 A129566 A129567 this_sequence A129569 A129570 A129571`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet (qq-quet(AT)mindspring.com), Apr 22 2007`
	EXTENSIONS	`More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 04 2007`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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