A131135 - OEIS

A131135

Denominator of (ordinary) expansion of log((x/2-1)/(x-1)).

1, 2, 8, 24, 64, 160, 128, 896, 2048, 4608, 10240, 22528, 16384, 106496, 229376, 491520, 1048576, 2228224, 524288, 9961472, 4194304, 6291456, 92274688, 192937984, 134217728, 838860800, 1744830464, 3623878656, 7516192768

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

FORMULA

a(n) = 2*A090634(n) for n > 0.

a(n) = denominator((1-1/2^n)/n), for n > 0, conjectured. - Michel Marcus, Sep 12 2019

MATHEMATICA

CoefficientList[Series[Log[(x/2-1)/(x-1)], {x, 0, 30}], x]//Denominator (* Harvey P. Dale, Oct 23 2025 *)

CROSSREFS

Cf. A090634, A131136.

Sequence in context: A075216 A127790 A006730 * A292218 A134401 A036289

Adjacent sequences: A131132 A131133 A131134 * A131136 A131137 A131138

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jun 17 2007

STATUS

approved