How can I compute sum of $i 4^i$?
97266
Summation by parts (finite calculus) of $\sum\limits_{i=0}^{n}i\cdot a^i$
139932
What is the square root of $i^4$?
64818
Use $\sum_{n=1}^\infty \frac{1}{n^4} = \frac{\pi^4}{90}$ to compute $\sum_{n=1}^\infty \frac{(-1)^n}{n^4}$
75457
How do i simplify the following: $\sum_{i=1}^n (3i^2+4) - \sum_{j=2}^{n+1} (3j^2+1)$
54435
What is the value of $1^i$?
144568
How closely can we estimate $\sum_{i=0}^n \sqrt{i}$
123955
How to compute $\sum\limits_{k=0}^n (-1)^k{2n-k\choose k}$?
109640
How do i find $(1+i)^{100}?$
145690
Quadratic algorithm for 4-SUM
36361
How to calculate the summation $(\sum_{p = k}^{n} \binom{n}{p}) / 2^n$ quickly?
63965
How can I compute the sum of $ {m\over\gcd(m,n)}$?
22657
How to find the sum of the infinite series?
3798
Finding formula for sum $S_n = \sum_{i=1}^n i(i-1)$
853
Write down the sum of sum of  sum of digits of $4444^{4444}$
70677
Finite Sum of Power?
50050
A formula for the power sums: $1^n+2^n+\dotsc +k^n=\,$?
25826
Proof of a combinatorial identity: $\sum\limits_{i=0}^n {2i \choose i}{2(n-i)\choose n-i} = 4^n$