Determine the value of summation form.
14239
How to show $\sum_{k=0}^{n}\binom{n+k}{k}\frac{1}{2^k}=2^{n}$
133076
Prove this sum equal to an expression.
110996
Sum of the form $r+r^2+r^4+\dots+r^{2^k} = \sum_{i=1}^k r^{2^i}$
137027
Find the value of $\sum_{n=0}^\infty\frac{1}{9n^2+9n+2}$
42127
How to force equation to be closer to the sum operator?
156702
Finding value of an expression
155014
How to justify the definition of summation $s_n=\sum_{i=1}^n a_i=a_1+\cdots+a_n$?
89460
Handling numbers and calculations
74315
Constraint on variables in summation
138081
How to determine whether a number can be written as a sum of two squares?
102339
How to compute the sum of a series
74120
Find the value of $\sum_{n=1}^{\infty} \frac{2}{n}-\frac{4}{2n+1}$
151189
calculate the sum of an infinite series
17325
Display Sum of a calculated column
114889
Solve summation $\sum_{i=1}^n \lfloor e\cdot i \rfloor $
67377
Calculations after NumberForm
28109
Conjectural closed-form representations of sums, products or integrals