Lambert summation

Lambert summation, also known as Lambert series, refers to a specific type of series that typically takes the form: \[ \sum_{n=1}^{\infty} \frac{x^n}{1 - x^n} \] for a particular argument \( x \). This series can be interpreted in various contexts, including number theory and combinatorics. More generally, Lambert series can be related to partitions of integers and are often used in the study of generating functions.