How can I evaluate $\sum_{n=2}^\infty n(n-1)x^n$?
105151
Geometric Summation Question $\sum_{n=2}^{\infty} n(n-1)x^{(n-2)} = \frac{2}{(1-x)^3}$
4253
How to calculate: $\sum_{n=1}^{\infty} n a^n$
74120
Find the value of $\sum_{n=1}^{\infty} \frac{2}{n}-\frac{4}{2n+1}$
84949
Evaluate $\prod_{n=1}^\infty \frac{2^n-1}{2^n}$
913
Evaluating $\sum_{n=0}^{\infty}{\sin^{3}\left(3^{n}\right) \over 3^{n}}$
145798
Generalizing $\sum \limits_{n=1}^{\infty }n^{2}/x^{n}$ to $\sum \limits_{n=1}^{\infty }n^{p}/x^{n}$
146651
Evaluting sum $\sum \limits_{n=0}^\infty\frac{n^k}{n!}$
135927
Calculating $\sum_{n=1}^\infty\frac{1}{(n-1)!(n+1)}$
52278
How to solve $\sum_{k=2}^\infty {\frac{1}{k^2-1}}$
8705
Evaluation of $\sum_{x=0}^\infty e^{-x^2}$
6838
Evaluate the series $S_n = \sum_{k=1}^n\log\frac {k (k + 2)}{(k + 1)^2}$
17332
How to compute $\sum\limits_{n=1}^{\infty}\frac{1}{x^n-1}$?
84147
Evaluating $\sum_{n=1}^\infty \frac{2^{2n-1}}{5^{n+1}}$
61850
Compute $\sum_{k=0}^{\infty}\frac{1}{2^{k!}}$
47980
Infinite series $\sum _{n=2}^{\infty } \frac{1}{n \log (n)}$
141892
How to evaluate $\int_0^\infty \frac{1}{x^n+1} dx$
125148
Summation of series $\sum_{k=0}^\infty 2^k/\binom{2k+1}{k}$