id:A104528 - OEIS Search Results

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

+0
2

1, 3, 2, 7, 17, 37, 43, 23, 25, 53, 59, 61, 67, 35, 73, 377, 407, 139, 149, 457, 118, 487, 517, 1049, 363, 373, 383, 1169, 1229, 311, 163, 331, 677, 173, 707, 2141, 2231, 569, 2321, 4687, 4867, 614, 1273, 644, 1303, 2651, 2741, 2759, 2819, 2849, 1447, 731 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`1,3/2,2,7/3,17/6` `a(4)=7 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->numer(sum(1/tau(k), k=1..n)): seq(a(n), n=1..57);`
	CROSSREFS	`Cf. A104529.` `Sequence in context: A052546 A049968 A049970 this_sequence A111928 A100985 A021757` `Adjacent sequences: A104525 A104526 A104527 this_sequence A104529 A104530 A104531`
	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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