How to calculate the sum $\sum_{i=0}^\infty i^nx^i$
102942
Compute the sum $\sum_{k=1}^{\infty}k^mz^k$ where $|z|<1$
91784
Calculating $\sum_{n=1}^\infty {\frac{1}{2^nn(3n-1)}}$
43320
Find the sum of the power series $\sum_{n=1}^\infty n*(n+1)*x^n$
101017
What is the sum of $\sum\limits_{i=1}^{n}ip^i$?
6416
How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
59253
Summing the power series $\sum\limits_{n=0}^\infty (-1)^n \frac{x^{2n+1}}{2n+1}\prod\limits_{k=1}^n\frac{2k-1}{2k} $
114031
Show that $\sum_{n=0}^\infty r^n e^{i n \theta} = \frac{1- r\cos(\theta)+i r \sin(\theta)}{1+r^2-2r\cos(\theta)}$
93837
How to compute infinite series $\sum_{n=0}^{\infty} ne^{-n}$
133955
Compute: $\sum_{k=1}^{\infty}\sum_{n=1}^{\infty} \frac{1}{k^2n+2nk+n^2k}$
128200
Sequence sum question: $\sum_{n=0}^{\infty}nk^n$
129734
Computing $\sum_{k=1}^{\infty}\frac{1}{k}\int_{\pi k}^{\infty}\frac{\sin(x)}{x}dx$
14223
Find the infinite sum $\sum_{n=1}^{\infty}\frac{1}{2^n-1}$
152227
How to sum this series to infinity: $\sum_{n=0}^{\infty} \frac1{2^{2^n}}$
74120
Find the value of $\sum_{n=1}^{\infty} \frac{2}{n}-\frac{4}{2n+1}$
107976
Find a closed formula for $\sum_{n=1}^\infty nx^{n-1}$
2678
Values of $\sum_{n=0}^\infty x^n$ and $\sum_{n=0}^N x^n$
3798
Finding formula for sum $S_n = \sum_{i=1}^n i(i-1)$