a triangle with as many integers as possible
31:10
the geometry of the third derivative
18:04
the most creative digit sum problem I have seen!!
23:18
What REALLY is e? (Euler’s Number)
26:31
How to Take the Factorial of Any Number
16:49
squares tumbling in a right triangle
21:20
Does -1/12 Protect Us From Infinity? - Numberphile
18:26
your Calculus teacher lied* to you
13:45