id:A024619 - OEIS Search Results

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Numbers that are not powers of primes; complement of A000961.

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26

6, 10, 12, 14, 15, 18, 20, 21, 22, 24, 26, 28, 30, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110, 111, 112 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The sequence of numbers divisible by a prime number of primes coincides with this up to 210, which has 4 prime factors. - Lior Manor (lior.manor(AT)gmail.com) Aug 23 2001` `A085970(n) = Max{k: a(k)<=n}.` `Numbers n such that LCM of proper divisors of n equals neither 1 nor n. - Labos E. (labos(AT)ana.sote.hu), Dec 01 2004`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	FORMULA	`A020500(a(n))=1 - Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 26 2003`
	MATHEMATICA	`Select[Range@111, Length@FactorInteger@# > 1 &] (from Robert G. Wilson v (rgwv(at)rgwv.com), Dec 07 2005)`
	CROSSREFS	`A014963(a(n))=1.` `A001221(a(n)) > 1.` `Adjacent sequences: A024616 A024617 A024618 this_sequence A024620 A024621 A024622` `Sequence in context: A141467 A105642 A064040 this_sequence A106543 A007774 A030231`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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