id:A073353 - OEIS Search Results

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Sum of n and its square-free kernel.

+0
3

2, 4, 6, 6, 10, 12, 14, 10, 12, 20, 22, 18, 26, 28, 30, 18, 34, 24, 38, 30, 42, 44, 46, 30, 30, 52, 30, 42, 58, 60, 62, 34, 66, 68, 70, 42, 74, 76, 78, 50, 82, 84, 86, 66, 60, 92, 94, 54, 56, 60, 102, 78, 106, 60, 110, 70, 114, 116, 118, 90, 122, 124, 84, 66, 130, 132 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) is even; a(n)=2*n iff n is square-free.` `Least k >n such that n divides k^n - Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 09 2002` `a(n) = smallest integer > n such that the positive integers coprime to a(n) are also coprime to n. - Leroy Quet (qq-quet(AT)mindspring.com), Dec 24 2006`
	FORMULA	`a(n) = n + A007947(n).`
	CROSSREFS	`Cf. A007947, A005117, A066503, A064549, A003557, A073354.` `Sequence in context: A053568 A037225 A060685 this_sequence A066820 A087459 A123258` `Adjacent sequences: A073350 A073351 A073352 this_sequence A073354 A073355 A073356`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 29 2002`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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