Harmonic number (disambiguation)

In number theory, the harmonic numbers are the sums of the inverses of integers, forming the harmonic series. Harmonic number may also refer to:

Harmonic, a periodic wave with a frequency that is an integral multiple of the frequency of another wave
An integer not divisible by any prime other than 2 or 3, as defined by Philippe de Vitry
Harmonic divisor numbers, also called Ore numbers or Ore's harmonic numbers, positive integers whose divisors have an integral harmonic mean

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