Is there a closed form for $A=\displaystyle \sum_{n=0}^{\infty}\frac{1}{n^n}=\frac{1}{1}+\frac{1}{2^2}+\frac{1}{3^3}+...?$
12423
"Closed" form for $\sum \frac{1}{n^n}$
67271
$\sum_{n=-\infty}^{\infty}\frac{1}{(u +n)^2}=\frac{\pi^2}{(\sin \pi u)^2}$
32637
What is the sum of this series: $\displaystyle\sum_{n=0}^{\infty} \dfrac{a^n}{(3n)!}$
152802
How find series $\sum_{n=1}^{\infty}\frac{(-1)^{[\sqrt[m]{n}]}}{n^a}$?
140462
Find a closed form for the power series $f_p(x)=\sum\limits_{n=0}^\infty\frac{n^p}{n!}x^n$
84335
Solving for $\sum_{n = 1}^{\infty} \frac{n^3}{8^n}$?
25504
How to find sum of the infinite series $\sum_{n=1}^{\infty} \frac{1}{ n(2n+1)}$
32866
How find this sum $\sum\limits_{n=0}^{\infty}\frac{1}{(3n+1)(3n+2)(3n+3)}$
107976
Find a closed formula for $\sum_{n=1}^\infty nx^{n-1}$
129801
Finding a closed form for $\sum^{n}_{k=1} \frac{k}{(k+1)!} $
151477
computing the series $\sum_{n=1}^\infty \frac{1}{n^2 2^n}$
104646
Question on simplification of $\sum_{n=1}^{\infty}\frac{2}{(2n+1)(2n+3)}$?
125915
An Infinite Double Summation $\sum_{k=1}^{\infty} \sum_{n=1}^{\infty} \frac{1}{n^2k^2(n+k)^2}$?
55339
Find the sum $\sum_{n=1}^{\infty}\frac{ 1}{n^{2}(2n-1)}$
59485
Infinite Series: $\sum_{n=1}^\infty \frac{1}{2^nn}$
42736
Is there a closed form for $\sum_{k=0}^n \frac{x^k}{k!}$?
135218
Closed Form for Factorial Sum