Need to evaluate the series $\sum_{i = 0}^n i^5$
50050
A formula for the power sums: $1^n+2^n+\dotsc +k^n=\,$?
103840
Calculate $\sum_{k=1}^n k2^{n-k}$
48200
Simplify $\sum_{i=0}^n (i+1)\binom ni$
104078
Calculate the sum of the infinite series $\sum_{n=0}^{\infty} \frac{n}{4^n}$
63863
Evaluate: $\sum_{n=1}^{\infty}\frac{1}{n k^n}$
34637
Evaluating $\sum\frac{\sin(n)}{n^a}$
117200
Evaluation of $ \sum_{k=0}^n \cos k\theta $
77519
I'm searching for the formula of the series $ \sum_{n=0}^{\infty}a^{n^l} $
913
Evaluating $\sum_{n=0}^{\infty}{\sin^{3}\left(3^{n}\right) \over 3^{n}}$
114911
Evaluate $\sum_{k = 0}^{n} {n\choose k} k^m$
6416
How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
138542
Evaluating sums question $\sum_{k=2}^n \frac{1}{k^2-1}$
107433
Prove the sum to n terms of the series
32637
What is the sum of this series: $\displaystyle\sum_{n=0}^{\infty} \dfrac{a^n}{(3n)!}$
117843
Finding the sum of series $\sum_{n=0}^∞ \frac{2^n + 3^n}{6^n}$
45588
Summing a series with a changing power
134610
Find the sum of finite series $S=\sum_{k=1}^{2015}{(-1)^{\frac{k(k+1)}{2}}}k$