A087689 - OEIS

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A087689

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

1, 4, 31, 54, 1709, 15536, 1982837, 33790906, 2469747943, 27183776108, 55662119048981, 241239187192714, 1976140351325516359, 28325754514689966424, 4277270178238249409079, 659561325495450888962794 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`a(3)=31 because 1/1 + 1/3 + 1/7 = 31/21.`
	CROSSREFS	`Cf. A000225, A087690.` `Sequence in context: A025416 A043082 A070522 * A059938 A179562 A005216` `Adjacent sequences: A087686 A087687 A087688 * A087690 A087691 A087692`
	KEYWORD	`frac,nonn`
	AUTHOR	`Keenan Pepper (keenanpepper(AT)gmail.com), Sep 27 2003`
	EXTENSIONS	`More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 26 2003`

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.