id:A070544 - OEIS Search Results

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Number of square-free numbers s such that n<s<2n.

+0
1

0, 1, 1, 3, 2, 3, 3, 5, 6, 6, 6, 8, 7, 7, 7, 9, 9, 11, 11, 13, 13, 14, 13, 15, 15, 15, 16, 17, 17, 18, 18, 19, 19, 20, 20, 22, 22, 22, 22, 24, 23, 24, 24, 26, 27, 27, 27, 29, 30, 30, 30, 32, 32, 34, 34, 36, 36, 37, 36, 38, 37, 38, 38, 39, 39, 40, 40, 41, 41, 42, 42, 44, 44, 44, 45 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`lim n -> infinity a(n)/n=6/Pi^2`
	PROGRAM	`(PARI) for(n=1, 100, print1(sum(i=n+1, 2*n-1, issquarefree(i)), ", "))`
	CROSSREFS	`Adjacent sequences: A070541 A070542 A070543 this_sequence A070545 A070546 A070547` `Sequence in context: A111114 A125748 A058680 this_sequence A087713 A089319 A117231`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 02 2002`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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