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HarmonicNumber
 HarmonicNumber[n] gives the n harmonic number  .
HarmonicNumber[n, r] gives the harmonic number  of order  .
Mathematical function (see Section A.3.10).
The harmonic numbers are given by  with  .
See Section 3.2.5.
See also: EulerGamma, PolyGamma, Zeta, Log.
New in Version 4.
Further Examples
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