id:A085895 - OEIS Search Results

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Group the natural numbers such that the product of the n-th group is divisible by 2^n . (1), (2) (3,4), (5,6,7,8), (9,10,11,12,13,14,),(15,16,17,18),... Sequence contains the product of the terms of the groups.

+0
4

1, 2, 12, 1680, 2162160, 73440, 96909120, 424097856000, 5339572260422400, 57407703889536000, 1573144097507348889600, 89247024757574635311360000, 131197375012291112448000, 6932022668773077815267328000 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`a(3) = 1680 = 5678 is divisible by 2^3. ( infact it is divisible by 2^4, but 56*7 is not divisible by 8.)`
	CROSSREFS	`Cf. A085896, A085897, A085898.` `Sequence in context: A123743 A111180 A085912 this_sequence A090904 A125295 A050649` `Adjacent sequences: A085892 A085893 A085894 this_sequence A085896 A085897 A085898`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Jul 10 2003`
	EXTENSIONS	`More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 13 2003`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.

AT&T Labs Research