id:A137230 - OEIS Search Results

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Numbers that are divisible by the number of their prime factors (excluding primes).

+0
1

4, 6, 10, 12, 14, 16, 18, 22, 24, 26, 27, 30, 34, 36, 38, 40, 42, 45, 46, 56, 58, 60, 62, 63, 66, 74, 75, 78, 80, 82, 84, 86, 88, 94, 96, 99, 100, 102, 104, 105, 106, 114, 117, 118, 120, 122, 132, 134, 136, 138, 140, 142, 144, 146, 147, 152, 153, 156, 158, 165, 166 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The sequence (S) is defined by n in S <--> {mod[n,r(n)] = 0 & n NOT prime}. r(n) is equivalent to BigOmega(n). This sequence is obtained from A074946 by excluding all primes within that sequence.`
	LINKS	`Eric Weisstein's MathWorld Prime Factor`
	EXAMPLE	`n = 3; not in S because does not satisfy "n NOT prime."` `n = 4; in S because satisfies both mod[n,r(n)] = 0 and n NOT prime.`
	CROSSREFS	`Cf. A074946.` `Adjacent sequences: A137227 A137228 A137229 this_sequence A137231 A137232 A137233` `Sequence in context: A109270 A137877 A120351 this_sequence A134333 A114331 A102070`
	KEYWORD	`nonn`
	AUTHOR	`William A. Tedeschi (fynmun(AT)hotmail.com), Mar 07 2008`

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Last modified January 7 17:35 EST 2009. Contains 152824 sequences.

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