id:A066779 - OEIS Search Results

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Sum of square-free numbers <=n.

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1, 3, 6, 6, 11, 17, 24, 24, 24, 34, 45, 45, 58, 72, 87, 87, 104, 104, 123, 123, 144, 166, 189, 189, 189, 215, 215, 215, 244, 274, 305, 305, 338, 372, 407, 407, 444, 482, 521, 521, 562, 604, 647, 647, 647, 693, 740, 740, 740, 740, 791, 791, 844, 844, 899, 899 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=sum(i=1, n, mu(i)^2*i).`
	CROSSREFS	`Cf. A013928.` `Sequence in context: A135610 A113497 A119980 this_sequence A132384 A066297 A012212` `Adjacent sequences: A066776 A066777 A066778 this_sequence A066780 A066781 A066782`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 18 2002`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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