What is $\sum_{k=0}^\infty {k^k \over (k!)^2}$?
117863
Series $\sum_{n=1}^\infty \frac{n^n}{(n!)^2}$
60891
Does $\sum\limits_{k=1}^\infty |\sin(ak)/k|$ converge?
56961
Evaluate the limit of $\sum_{n=1}^{\infty}\frac{n^2}{n!}$
28254
Why $\sum_{k=1}^{\infty} \frac{k}{2^k} = 2$?
103572
Does $\sum_{m=1}^{\infty}\sum_{n=1}^{\infty}a_{mn}^3=\sum_{n=1}^{\infty}\sum_{m=1}^{\infty}a_{mn}^3$ occur here?
128285
Why is $ \sum_{n=0}^{\infty}\frac{x^n}{n!} = e^x$?
7302
$\sum k! = 1! +2! +3! + \cdots + n!$ ,is there a generic formula for this?
81589
Find the sum of $\sum_{k=0}^{\infty} 1/[(r+2k+2)(s+2k+2)]$
139229
How to prove by arithmetical means that $\sum\limits_{k=1}^\infty \frac{((k-1)!)^2}{(2k)!} =\frac{1}{3}\sum\limits_{k=1}^{\infty}\frac{1}{k^{2}}$
140437
If $a_0\in R$ is a unit, then  $\sum_{k=0}^{\infty}a_k x^k$ is a unit in $R[[x]]$
50334
What is $\lim_{n \rightarrow \infty}\sum\limits_{k = 1}^n\frac{k}{n^2}$?
134152
Prove $\sum_{n=1}^\infty(e-\sum_{k=0}^n\frac1{k!})=1$
150148
Sum of $\sum^\infty_{n=2} \frac{1}{\ln{(n!)}}$
152698
Evaluation of $\sum_{n=0}^{\infty}\frac{1}{(n^4+n^2+1)n!}$
25395
Sum $\sum_{n=1}^\infty \frac{n^2}{(n+2)!}$
65672
Proof of the summation $n!=\sum_{k=0}^n \binom{n}{k}(n-k+1)^n(-1)^k$?
74117
Find the sum of series $\sum_{n=0}^{\infty}\frac{z^{kn}}{(kn)!}$