id:A072750 - OEIS Search Results

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Counting factor 7 in square-free numbers <=n.

+0
5

0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12 (list; graph; listen)

	OFFSET	`1,10`
	EXAMPLE	`The first 10 square-free numbers are: 1, 2, 3, 5, 6=23, 7, 10=25, 11, 13, and 14=2*7` `7 and 14 are divisible by 7, therefore a(10)=2.`
	CROSSREFS	`Cf. A005117, A072747, A072748, A072749, A072751.` `Sequence in context: A066339 A052375 A074279 this_sequence A029835 A074280 A000523` `Adjacent sequences: A072747 A072748 A072749 this_sequence A072751 A072752 A072753`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 08 2002`

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Last modified July 6 17:22 EDT 2008. Contains 140988 sequences.

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