How does arrive at the closed form expression of ap^1 + ap^2 + ... + ap^k?
26908
Partial Sums of Geometric Series
119606
Closed form of summation
110783
Simplifying complex expression with Mathematica
47052
How can I simplify this expression involving binomial coefficients?
69439
Infinite Sum of algebraic expression
113713
Closed formula for the sum of the following series
69045
Solving this summation: $\sum_{i=1}^k i\cdot2^i$
140462
Find a closed form for the power series $f_p(x)=\sum\limits_{n=0}^\infty\frac{n^p}{n!}x^n$
74294
How to simplify $\sum_{i=1}^{k}\binom{n + i - 1}{i}$?
64581
How to find the sum $\sum\limits_{k=1}^n (k^2+k+1)k!$?
136652
Closed form expression for the product $\prod\limits_{k=1}^{n}\left(1 - \frac{1}{ak}\right)$
92754
Closed form for the series: $\sum_{n=1}^{\infty}x^{n^2}$
10141
Find closed form expression for series expansion coefficients
10357
Do harmonic numbers have a “closed-form” expression?
49741
Finding a closed form for a recurrence relation $a_n=3a_{n-1}+4a_{n-2}$
152588
Expression for $n+n(n-1)+n(n-1)(n-2)+...+n!$
128608
Closed form for the series $a+a^p+(a^p)^p+\dots$