Envisioning (1³ + ... + n³) = (1 + ... + n)²
114074
Intuitive/Visual proof that $(1+2+\cdots+n)^2=1^3+2^3+\cdots+n^3$
114280
Computing $\sum_{n=1}^∞\frac{1}{(n+1)(n+2)(n+3)....(n+p)}$
141010
Computing $n$-th external power of standard simplectic form
153989
How to evaluate the sum $\frac{1}{\sqrt{n}}+\frac{1}{\sqrt{2n}}+\cdots+\frac{1}{\sqrt{n^2}}$ when $n$ grows?
135212
The square of an integer has form $3n$ or $3n+1$
75503
Rationalizing a Denominator with Cube Roots
126040
Geometric explanation of $\sqrt 2 + \sqrt 3 \approx \pi$
19497
Analogue of spherical coordinates in $n$-dimensions
63965
How can I compute the sum of $ {m\over\gcd(m,n)}$?
55582
How can I show that $\sqrt{1+\sqrt{2+\sqrt{3+\sqrt\ldots}}}$ exists?
113331
Number of ways a natural number can be written as sum of smaller natural number
102816
multiplication equivalent of the summation symbol
35856
Refining my knowledge of the imaginary number
135914
Evaluate the sum of cubes
132081
Geometrical interpretation of $(\sum_{k=1}^n k)^2=\sum_{k=1}^n k^3$
111602
Help with telescoping sum $\sum_{i=3}^n \frac{1}{i(i+3)} $
131080
Geometric representation of the sum of a Geometric Series