id:A072490 - OEIS Search Results

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Number of square-free numbers less than n.

+0
1

0, 0, 1, 2, 2, 3, 4, 5, 5, 5, 6, 7, 7, 8, 9, 10, 10, 11, 11, 12, 12, 13, 14, 15, 15, 15, 16, 16, 16, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 25, 26, 27, 28, 28, 28, 29, 30, 30, 30, 30, 31 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`a(10) = 5 as the square-free numbers less than 10 are 2,3,5,6 and 7.`
	CROSSREFS	`a(n) = A013928(n)-1, n>1.` `Sequence in context: A135585 A081094 A054633 this_sequence A085972 A136378 A099249` `Adjacent sequences: A072487 A072488 A072489 this_sequence A072491 A072492 A072493`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 14 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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