Unit 04: Number Theory


Unit 01

Unit 02

Unit 03

Unit 04

Unit 05

Unit 06

Unit 07

Unit 08

Unit 09

Unit 10

Unit 11

Unit 12

Unit 13
In unit 4, we cover number theory. The second document on roots of the Moebius function came up while preparing for the number theory lecture. I observed that on Fermat or Mersenne numbers we only see square free integers appearing. I spent a few hours writing something down, then looked up Guy's book on unsolved problems in number theory and saw that this has been noticed already. Actually, I'm not so sure as Guy whether there will be some square factors appear on numbers 2p -1 for large prime p. Statistically, we would expect them to appear earlier.
Some new slides about open problems in number theory:
Theorems in number theory:
Something about open problems in number theory 2021
The 10 best theorems in number theory 2021
Some slides from 2017: