Find sum of a series
105117
$1 + \frac{1}{3}\frac{1}{4} + \frac{1}{5}\frac{1}{4^2} + \frac{1}{7}\frac{1}{4^3} + ..........$
65653
Find a closed form of the series $\sum_{n=0}^{\infty} n^2x^n$
71824
Finding the sum of the series $\frac{1}{1!}+\frac{1+2}{2!}+\frac{1+2+3}{3!}+ \ldots$
93837
How to compute infinite series $\sum_{n=0}^{\infty} ne^{-n}$
91410
Finding the sum of this series: $1+\frac 12 + \frac 13 + \cdots + \frac 1{50}$
94871
Sum of an unorthodox infinite series
150928
Summation of a trigonometric series - $\frac{\sin n}{n}$
83145
Sum of rational numbers
62271
Find the sum of the series: $\cos^3 \alpha +\cos^3 {3\alpha} + \cos^3 {5\alpha}+....+\cos^3 {(2n-1)\alpha}$.
43320
Find the sum of the power series $\sum_{n=1}^\infty n*(n+1)*x^n$
148143
Find the sum to n terms as well as the sum to infinity of the series:
35036
Series $\sum_{n=1}^{\infty}\frac{\cos(nx)}{n^2}$
52241
Calculate sum of series $\sum \frac{n^2}{n!}$
143112
Series Summation,Convergence
138313
How to sum $\sum_{n=1}^{\infty} \frac{1}{n^2 + a^2}$?
30895
Compute the sum of the series $\sum_{n=1}^{\infty} \frac{1}{n \cdot 2^n}$
25504
How to find sum of the infinite series $\sum_{n=1}^{\infty} \frac{1}{ n(2n+1)}$