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A124432 a(n) = denominator of sum{k=1 to n} 1/H(k), H(k) =sum{j=1 to k}1/j. 0
1, 1, 3, 33, 825, 113025, 5538225, 60920475, 46360481475, 330503872435275, 20160736218551775, 1687675389591187637025, 145175524688023551724527525, 166370135063802174111446471957325, 194941377468714112878127508925972294225 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

MATHEMATICA

f[n_] := Denominator[ Sum[ 1/HarmonicNumber[j], {j, n}]]; Table[ f[n], {n, 0, 14}] (*Chandler*)

CROSSREFS

Cf. A096987.

Sequence in context: A003715 A009690 A174488 * A126466 A002112 A055549

Adjacent sequences:  A124429 A124430 A124431 * A124433 A124434 A124435

KEYWORD

frac,nonn

AUTHOR

Leroy Quet Dec 15 2006

EXTENSIONS

Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) and Robert G. Wilson v (rgwv(at)rgwv.com), Dec 16 2006

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Last modified February 13 12:58 EST 2012. Contains 205482 sequences.