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A081972

Consider the geometric progression 1,1/2,1/4,1/8,1/16,1/32,1/64,... group the terms such that the n-th group contains n terms like this (1/1),(1/2,1/4),(1/8,1/16,1,32),(1/64,1/128,1/256,1/512),... a(n) = floor[1/s(n)] where s(n) is the sum of the members of the n-th group.

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1, 1, 4, 34, 528, 16644, 1056832, 134744072, 34426978560, 17609382707216, 18023198899569664, 36902497546234101792, 151134176447977081540608, 1238015601761073699807559744, 20283028592561355523908308058112 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) = floor((2^(n*(n+1)/2 - 1))/(2^n-1))`
	CROSSREFS	`Adjacent sequences: A081969 A081970 A081971 this_sequence A081973 A081974 A081975` `Sequence in context: A156325 A111169 A002105 this_sequence A134354 A030243 A088077`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 03 2003`
	EXTENSIONS	`Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 08 2003`

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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