id:A087690 - OEIS Search Results

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Denominators of successive partial sums of sum(1/(2^n-1)).

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1, 3, 21, 35, 1085, 9765, 1240155, 21082635, 1539032355, 16929355905, 34654391537535, 150169029995985, 1230034524697113135, 17630494853991954935, 2662204722952785195185, 410511968279319477097527 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Least common denominators of A000225.`
	FORMULA	`a(n) = lcm(a(n-1), 2^n-1)`
	EXAMPLE	`a(4)=35 because 1/1 + 1/3 + 1/7 + 1/15 = 54/35.`
	CROSSREFS	`Cf. A000225, A087689.` `Adjacent sequences: A087687 A087688 A087689 this_sequence A087691 A087692 A087693` `Sequence in context: A089323 A100986 A075732 this_sequence A076169 A056387 A056377`
	KEYWORD	`frac,nonn`
	AUTHOR	`Keenan Pepper (cherylgpepper(AT)comcast.net), Sep 27 2003`
	EXTENSIONS	`More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 26 2003`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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