id:A058933 - OEIS Search Results

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a(1)=1; for k>0, if n is k-almost prime then a(n) = number of k-almost primes <= n.

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

	OFFSET	`1,3`
	FORMULA	`Ordinal transform of A001222 (bigomega). - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Aug 28 2006`
	EXAMPLE	`3 is prime, so a(3)=2. 10 is 2-almost prime (semiprime), so a(10)=4.`
	CROSSREFS	`Cf. A001358, A014612, A014613, A014614.` `Cf. A001222.` `Sequence in context: A061395 A156061 A124172 this_sequence A087470 A158456 A084531` `Adjacent sequences: A058930 A058931 A058932 this_sequence A058934 A058935 A058936`
	KEYWORD	`easy,nonn`
	AUTHOR	`Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jan 11 2001`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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