id:A109894 - OEIS Search Results

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Group the natural numbers so that every 2n-th group product is divisible by the single number in the next group. (1), (2,3,4,5), (6), (7,8,9,10,11), (12), (13,14,15,16,17,18,19),(20), (21,22,23,24,25,26,27),(28),...Sequence contains the ratio of the product of terms in 2n-th group and the (2n+1)-th group.

+0
4

1, 20, 660, 12697776, 159845400 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(2) = 234*5/6. = 20.`
	CROSSREFS	`Cf. A109895, A109896, A109897.` `Sequence in context: A129906 A125722 A006410 this_sequence A034404 A012802 A049214` `Adjacent sequences: A109891 A109892 A109893 this_sequence A109895 A109896 A109897`
	KEYWORD	`more,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 13 2005`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research