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A068565 Denominators of Sum_{k=1..n} 1/(k * 2^k). 2
2, 8, 3, 192, 960, 1920, 1680, 215040, 645120, 64512, 1419264, 11354112, 147603456, 295206912, 46126080, 47233105920, 802962800640, 802962800640, 15256293212160, 61025172848640, 61025172848640, 122050345697280 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Sum_{k>=1} 1/(k * 2^k) = log(2).

LINKS

Table of n, a(n) for n=1..22.

PROG

(PARI) a(n) = denominator(sum(k=1, n, 1/(k * 2^k))); \\ Michel Marcus, Jun 26 2019

CROSSREFS

Cf. A068566.

Sequence in context: A218609 A268491 A076588 * A092042 A158934 A021356

Adjacent sequences:  A068562 A068563 A068564 * A068566 A068567 A068568

KEYWORD

easy,frac,nonn

AUTHOR

Benoit Cloitre, Mar 25 2002

STATUS

approved

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Last modified May 24 21:08 EDT 2022. Contains 354043 sequences. (Running on oeis4.)