id:A081770 - OEIS Search Results

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Numbers twice their square-free kernel (A007947).

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4, 12, 20, 28, 44, 52, 60, 68, 76, 84, 92, 116, 124, 132, 140, 148, 156, 164, 172, 188, 204, 212, 220, 228, 236, 244, 260, 268, 276, 284, 292, 308, 316, 332, 340, 348, 356, 364, 372, 380, 388, 404, 412, 420, 428, 436, 444, 452, 460, 476, 492, 508, 516, 524 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) = 2A039956(n)= 4A056911(n).`
	EXAMPLE	`84=2237=2(237)=2*sfk(84), therefore 84 is a term.`
	CROSSREFS	`Cf. A013929, A005117.` `Adjacent sequences: A081767 A081768 A081769 this_sequence A081771 A081772 A081773` `Sequence in context: A141065 A031065 A017113 this_sequence A062876 A085039 A038429`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 10 2003`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.

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