Is there any formula for this sum of power of positive integers?
129536
Asymptotic behaviour of sums of consecutive powers
109599
A finite sum involving the binomial coefficients and the harmonic numbers
50615
Expressing a Non Negative Integer as Sums of Two Squares
142992
Prove that for every positive integer $n$, $1/1^2+1/2^2+1/3^2+\cdots+1/n^2\le2-1/n$
21000
Calculating $\sum_{k=1}^nk(k!)$ combinatorially
44111
Find the value of $\sum_{k=1}^{n}k\binom{n}{k}$?
104920
Can we find positive integers $a$ and $k \geq 2$ with $2^n - 1 = a^k$?
116360
Sum of n-th roots of unity
94060
Sum of square binomial coefficients
3798
Finding formula for sum $S_n = \sum_{i=1}^n i(i-1)$
158124
Sum of all the positive integers problem
99453
Sum of $k$-th powers
74294
How to simplify $\sum_{i=1}^{k}\binom{n + i - 1}{i}$?
132984
$\sum\limits_{k=0}^{\frac{p-1}2}3^k\binom{p}{k}\equiv 2^p-1\pmod{p^2}$
146746
A formula for the sum of the triangular numbers?
10920
$\delta_2(n)$ the sum of the squares of the positive divisors of $n$.
101017
What is the sum of $\sum\limits_{i=1}^{n}ip^i$?