Closed form of $\sum_{i=1}^{N} \frac{1}{i}$?
68853
Is there any formula for the series $1 + \frac12 + \frac13 + \cdots + \frac 1 n = ?$
39659
Is there a closed formula for this summation?
136444
Evaluating $\sum_{n=0}^\infty\frac{(-1)^n}{3n+1}$
37007
Evaluating $\sum_{k=1}^{n} \frac{1}{k(k+1)}$
107976
Find a closed formula for $\sum_{n=1}^\infty nx^{n-1}$
126105
Compute $\sum_{k=1}^{n} \frac 1 {k(k + 1)} $
111524
Information on the sum $\sum_{n=1}^\infty \frac{\log n}{n!}$
17056
How to find answer to the sum of series $\sum_{n=1}^{\infty}\frac{n}{2^n} $
41751
$\sum_{n=1}^\infty \frac{i^n}{n}$ converge?
151757
Simplify $\sum_{i=0}^{N/2}{N-i\choose i}$
62504
Is there any known relationship between $\sum_{i=1}^{n} f(i)$ and $\sum_{i=1}^{n} \dfrac {1}{f(i)}$
36457
Closed form for $\int \frac{1}{\sin^nx +\cos^mx}dx$
36742
The sum of $(-1)^n \frac{\ln n}{n}$
101017
What is the sum of $\sum\limits_{i=1}^{n}ip^i$?
158616
A closed form for the sum $S = \frac {2}{3+1} + \frac {2^2}{3^2+1} + \cdots + \frac {2^{n+1}}{3^{2^n}+1}$ is ...
5537
Closed form for $ \int_0^\infty {\frac{{{x^n}}}{{1 + {x^m}}}dx }$
53658
Find the sum series $\sum_{n=1}^{+\infty} \frac{(-1)^{n-1}(2n-1)}{2^{n-1}}$