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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
OFFSET
1,1
COMMENTS
Sum_{k>=1} 1/(k * 2^k) = log(2).
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
KEYWORD
easy,frac,nonn
AUTHOR
Benoit Cloitre, Mar 25 2002
STATUS
approved