id:A104529 - OEIS Search Results

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Denominator of Sum_{k=1..n} 1/tau(k), where tau(k) is the number of divisors function.

+0
2

1, 2, 1, 3, 6, 12, 12, 6, 6, 12, 12, 12, 12, 6, 12, 60, 60, 20, 20, 60, 15, 60, 60, 120, 40, 40, 40, 120, 120, 30, 15, 30, 60, 15, 60, 180, 180, 45, 180, 360, 360, 45, 90, 45, 90, 180, 180, 180, 180, 180, 90, 45, 90, 360, 360, 45, 180, 90, 45, 180, 180, 90, 45, 315, 1260 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`1,3/2,2,7/3,17/6` `a(4)=3 because 1/tau(1)+1/tau(2)+1/tau(3)+1/tau(4)=1/1+1/2+1/2+1/3=7/3.`
	MAPLE	`with(numtheory): a:=n->denom(sum(1/tau(k), k=1..n)): seq(a(n), n=1..70);`
	CROSSREFS	`Cf. A104528.` `Sequence in context: A020992 A025110 A075346 this_sequence A095024 A049900 A024741` `Adjacent sequences: A104526 A104527 A104528 this_sequence A104530 A104531 A104532`
	KEYWORD	`frac,nonn`
	AUTHOR	`Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 12 2005`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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