16:47

Prove that n^3 +11n is divisible by 6

20:37

Integrate x^-x dx

18:35

The Basel Problem

8:59

Solving a Functional Equation | f(x)+f(x-1)=x^2

12:59

if x+y=8, find the max of x^y (Lambert W function)

16:40

Number of digits of n!

25:46

integral of sqrt of tanx

21:24

A long road to the limit