Summation of $n/3^n$
118436
Identifying the series $\sum\limits_{k=-\infty}^{\infty} 2^k x^{2^k}$
111602
Help with telescoping sum $\sum_{i=3}^n \frac{1}{i(i+3)} $
913
Evaluating $\sum_{n=0}^{\infty}{\sin^{3}\left(3^{n}\right) \over 3^{n}}$
35342
Show that $ \sum_{n=2}^m \binom{n}{2} = \binom{m+1}{3}$
130945
Summation using residues
104646
Question on simplification of $\sum_{n=1}^{\infty}\frac{2}{(2n+1)(2n+3)}$?
117843
Finding the sum of series $\sum_{n=0}^∞ \frac{2^n + 3^n}{6^n}$
11612
How to show that $\sum_{k=1}^n k(n+1-k)=\binom{n+2}3$?
39659
Is there a closed formula for this summation?
36361
How to calculate the summation $(\sum_{p = k}^{n} \binom{n}{p}) / 2^n$ quickly?
84335
Solving for $\sum_{n = 1}^{\infty} \frac{n^3}{8^n}$?
91784
Calculating $\sum_{n=1}^\infty {\frac{1}{2^nn(3n-1)}}$
123144
Formula : (Exact) Sum of $1^1+2^2+3^3+..+n^n$ (modulo $10^m$) with relatively small $m$
80177
Sum from $n=1$ to $N$ of $\sin(nx)/2^n$
121554
Finding $\sum\frac{1}{2^n(n+1)}$
132984
$\sum\limits_{k=0}^{\frac{p-1}2}3^k\binom{p}{k}\equiv 2^p-1\pmod{p^2}$
103840
Calculate $\sum_{k=1}^n k2^{n-k}$