id:A080306 - OEIS Search Results

Search: id:A080306

Displaying 1-1 of 1 results found.

page 1

Numerator of Sum(k^mu(k): 1<=k<=n), where mu is the Moebius function (A008683).

+0
6

1, 3, 11, 17, 91, 271, 1927, 2137, 2347, 4447, 49127, 51437, 670991, 1091411, 1541861, 1571891, 26752177, 27262687, 518501563, 528201253, 731894743, 945287923, 21751321919, 21974414789, 22197507659, 27997922279, 28221015149 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(6) = 1^mu(1)+2^mu(2)+3^mu(3)+4^mu(4)+5^mu(5)+6^mu(6) = 1^1+2^(-1)+3^(-1)+4^0+5^(-1)+6^1 = 1 + 1/2 + 1/3 + 1 + 1/5 + 6 = (30+15+10+30+6+180)/30 = 271/30, therefore a(6)=271, A080326(6)=30.`
	CROSSREFS	`Denominators are in A080326. Cf. A080304, A080305.` `Adjacent sequences: A080303 A080304 A080305 this_sequence A080307 A080308 A080309` `Sequence in context: A061368 A072982 A124787 this_sequence A036448 A128346 A128031`
	KEYWORD	`nonn,frac`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 13 2003`

page 1

Search completed in 0.002 seconds

Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research