What is the luckiest prime?
28:27
Problem Solving | Techniques from Number Theory
16:44
The smallest such prime...
18:39
Don't just solve, tell me how many solutions.
24:20
Too hard for the IMO? Too easy?
13:35
is this one fun?
12:17
5 facts for Prime day!
38:28
A Miraculous Proof (Ptolemy's Theorem) - Numberphile
7:09