id:A082998 - OEIS Search Results

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a(n) = card{ x <= n : omega(x) = 3 }.

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

	OFFSET	`1,42`
	REFERENCES	`G. Tenenbaum, Introduction a la theorie analytique et probabiliste des nombres, p. 203, Publications de l'Institut Cartan,1990.`
	FORMULA	`a(n) ~ (1/2)(n/log(n))log(log(n))^2`
	PROGRAM	`(PARI) a(n)=sum(i=1, n, if(omega(i)-3, 0, 1))`
	CROSSREFS	`Cf. A025528, A072000.` `Sequence in context: A105514 A062153 A135661 this_sequence A076620 A121900 A056811` `Adjacent sequences: A082995 A082996 A082997 this_sequence A082999 A083000 A083001`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 30 2003`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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