Value of Series $\sum_{n=1}^{\infty} \frac{1}{1-x^n}$

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i have encountered the following series on a Physics problem: \begin{equation} S = \sum_{n=1}^{\infty} \frac{1}{1-x^n} \end{equation}

I would like to know if there is any specific Function assigned to this series. Thanks for you attention.