A very interesting polynomial problem that was longlisted for the IMO!
17:13
A very unfriendly integral problem!
24:20
Too hard for the IMO? Too easy?
12:20
A short and tricky number theory problem | IMO 2007 P5
12:46
How are 67 and 2010 useful for this polynomial problem?
13:26
A Fun One from the Vietnamese IMO
12:52
A very classic number theory problem
7:27
Solving An Insanely Hard Problem For High School Students
13:55