What is the sum of this series: $\displaystyle\sum_{n=0}^{\infty} \dfrac{a^n}{(3n)!}$
60197
Infinite Series $\sum\limits_{n=1}^\infty\frac{x^{3n}}{(3n-1)!}$
913
Evaluating $\sum_{n=0}^{\infty}{\sin^{3}\left(3^{n}\right) \over 3^{n}}$
76387
Evaluate the series $\sum_{n=1}^{\infty} \frac{2^{[\sqrt{n}]}+2^{-[\sqrt{n}]}}{2^n}$
107789
Sum of $\sum \limits_{n=0}^{\infty} \frac{1}{(kn)!}$
71824
Finding the sum of the series $\frac{1}{1!}+\frac{1+2}{2!}+\frac{1+2+3}{3!}+ \ldots$
150148
Sum of $\sum^\infty_{n=2} \frac{1}{\ln{(n!)}}$
22657
How to find the sum of the infinite series?
138313
How to sum $\sum_{n=1}^{\infty} \frac{1}{n^2 + a^2}$?
37771
Sum of a power series $n x^n$
69270
Questions about the powerseries $\sum_{n=0}^{\infty}\frac{1}{n^d}z^n,d\in\mathbb{R},z\in\mathbb{C}$
53658
Find the sum series $\sum_{n=1}^{+\infty} \frac{(-1)^{n-1}(2n-1)}{2^{n-1}}$
17686
Evaluate the infinite series $\sum_{r=1}^{\infty} \frac{2^{-r}}{r^{2}}$
29170
Find the sum of the series $\sum \frac{1}{n(n+1)(n+2)}$
49052
Find $\sum_{n=1}^\infty \frac{n^3}{n!}$.
17056
How to find answer to the sum of series $\sum_{n=1}^{\infty}\frac{n}{2^n} $
57372
Series convergence of $\sum_{n=1}^{\infty}\frac{1}{n^3}$
91316
Sum of the series $\sum _{ r=1 }^{ \infty }{ \frac { { r }^{ 3 } }{ r! } } $