harmonic series

Noun

 * 1)  The divergent series whose terms are the reciprocals of the positive integers; the series $$\textstyle\sum_{n=1}^\infty \frac 1 n$$.
 * 2)  The sequence of all positive integer multiples of a base.

Translations

 * Finnish: harmoninen sarja
 * French: série harmonique
 * German: harmonische Reihe
 * Japanese: 調和級数
 * Polish: szereg harmoniczny
 * Russian: гармони́ческий ряд