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A124432 Denominator of Sum_{k=1..n} 1/H(k), H(k) = Sum_{j=1..k} 1/j. 4
1, 1, 3, 33, 825, 113025, 5538225, 60920475, 46360481475, 330503872435275, 20160736218551775, 1687675389591187637025, 145175524688023551724527525, 166370135063802174111446471957325, 194941377468714112878127508925972294225 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

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

CROSSREFS

Cf. A096987.

Sequence in context: A210833 A174488 A289695 * A234715 A126466 A002112

Adjacent sequences:  A124429 A124430 A124431 * A124433 A124434 A124435

KEYWORD

frac,nonn

AUTHOR

Leroy Quet, Dec 15 2006

EXTENSIONS

Extended by Ray Chandler and Robert G. Wilson v, Dec 16 2006

STATUS

approved

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Last modified March 26 01:08 EDT 2019. Contains 321479 sequences. (Running on oeis4.)