A068565 - OEIS

A068565

Denominators of Sum_{k=1..n} 1/(k * 2^k).

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