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A124432
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Denominator of Sum_{k=1..n} 1/H(k), where H(k) = Sum_{j=1..k} 1/j is the k-th harmonic number.
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4
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1, 1, 3, 33, 825, 113025, 5538225, 60920475, 46360481475, 330503872435275, 20160736218551775, 1687675389591187637025, 145175524688023551724527525, 166370135063802174111446471957325, 194941377468714112878127508925972294225
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OFFSET
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0,3
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COMMENTS
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LINKS
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MATHEMATICA
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f[n_] := Denominator[ Sum[ 1/HarmonicNumber[j], {j, n}]]; Table[ f[n], {n, 0, 14}] (* Ray Chandler, Dec 16 2006 *)
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PROG
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(PARI) a(n) = denominator(sum(k=1, n, 1/sum(j=1, k, 1/j))); \\ Michel Marcus, Mar 24 2023
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CROSSREFS
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KEYWORD
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frac,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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