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Example:

1, ½, 1/3, ¼…

The reciprocal form an arithmetic sequence. In the harmonic sequence 2/3, ½, 2/5, 1/3, 2/7…

We can say that ½ is the harmonic means between 2/3 and 2/5; ½, 2/5 and 1/3 are the harmonic between 2/3 and 2/7. 2/3+1/2+2/5+… is a harmonic series.