Harmonic progression (mathematics)
Progression formed by taking the reciprocals of an arithmetic progression / From Wikipedia, the free encyclopedia
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For the musical term, see Chord progression.
In mathematics, a harmonic progression (or harmonic sequence) is a progression formed by taking the reciprocals of an arithmetic progression.
Equivalently, a sequence is a harmonic progression when each term is the harmonic mean of the neighboring terms.
As a third equivalent characterization, it is an infinite sequence of the form
where a is not zero and −a/d is not a natural number, or a finite sequence of the form
where a is not zero, k is a natural number and −a/d is not a natural number or is greater than k.