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A103931
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Denominators of squares of harmonic numbers A001008/A002805.
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2
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1, 4, 36, 144, 3600, 400, 19600, 78400, 6350400, 6350400, 768398400, 768398400, 129859329600, 129859329600, 129859329600, 519437318400, 150117385017600, 16679709446400, 6021375110150400, 240855004406016, 26761667156224
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OFFSET
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1,2
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COMMENTS
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The corresponding numerators are given in A103930. For the rational see the link there.
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LINKS
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FORMULA
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a(n)=denominator(H(n)^2), with the harmonic numbers H(n)=A001008(n)/A002805(n), n>=1.
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MATHEMATICA
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Denominator[HarmonicNumber[Range[30]]^2] (* Harvey P. Dale, Oct 16 2022 *)
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CROSSREFS
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KEYWORD
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nonn,easy,frac
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AUTHOR
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STATUS
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approved
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