how can I calculate the sum of $i*2^i$ from $i=0$ to $\log n$?
6416
How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
121554
Finding $\sum\frac{1}{2^n(n+1)}$
69045
Solving this summation: $\sum_{i=1}^k i\cdot2^i$
155439
How can I calculate this Riemann sum?
4253
How to calculate: $\sum_{n=1}^{\infty} n a^n$
125933
On the series $\sum \limits_{n=2}^{\infty} \frac{(-1)^n}{n \log n}$
88973
How do you calculate this sum $\sum_{n=1}^\infty nx^n$?
148442
Show that the sum $\sum_{k = 0}^n 2^k \binom{n}{k}$ is equal to $3^n$
33082
Proving $\sum_{i=0}^n 2^i=2^{n+1}-1$ by induction.
109640
How do i find $(1+i)^{100}?$
10222
Simplify $\sum (x_i- \mu)^2$
102486
Simplifying $\sum_{i=1}^n{\lfloor \frac{n}{i} \rfloor}$?
97984
Express as sum of powers
114889
Solve summation $\sum_{i=1}^n \lfloor e\cdot i \rfloor $
80177
Sum from $n=1$ to $N$ of $\sin(nx)/2^n$
67731
Calculate the sum of infinite series with general term $\frac{n^2}{2^n}$.
125148
Summation of series $\sum_{k=0}^\infty 2^k/\binom{2k+1}{k}$