What would be the general form of $\sum_{i=1}^n \frac{1}{i}$?
10357
Do harmonic numbers have a “closed-form” expression?
84147
Evaluating $\sum_{n=1}^\infty \frac{2^{2n-1}}{5^{n+1}}$
16967
Sum : $\sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)^3}$
42736
Is there a closed form for $\sum_{k=0}^n \frac{x^k}{k!}$?
69498
What is $\sum_{r=0}^n \frac{(-1)^r}{\binom{n}{r}}$?
53116
How find this sum $f(n)=\sum_{i=1}^{n}\dfrac{\binom{n}{i}}{i}$
101017
What is the sum of $\sum\limits_{i=1}^{n}ip^i$?
26446
Find the sum : $\displaystyle\sum_{i=0}^n \frac{2^i}{1+x^{2^{i}}}$
135927
Calculating $\sum_{n=1}^\infty\frac{1}{(n-1)!(n+1)}$
144568
How closely can we estimate $\sum_{i=0}^n \sqrt{i}$
96945
General formula of $\sum_{n\ge1}{\binom{2n}{n}^{-k}}$.
114280
Computing $\sum_{n=1}^∞\frac{1}{(n+1)(n+2)(n+3)....(n+p)}$
108298
Prove $\sum_{i=1}^{i=n}\frac{a_i}{S-a_i}\geqslant \frac{n}{n-1}$ and $\sum_{i=1}^{i=n}\frac{S-a_i}{a_i}\geqslant n(n-1)$.
48200
Simplify $\sum_{i=0}^n (i+1)\binom ni$
36742
The sum of $(-1)^n \frac{\ln n}{n}$
128913
A proof of $\sum_{i=1}^{n}(-1)^{i-1}\binom{n}{i}\frac{1}{i}=\frac{1}{1}+\frac{1}{2}+....+\frac{1}{n}$
139074
Question about $a_n=\sum_{k=1}^n \frac{n}{n^2+k}\ $for $ n \in\mathbb{N}$