MathDB

N3

Part of 2021-IMOC qualification

Problems(1)

A number with 2021 Prime divisors

Source: 2021 IMOC qualification problem, N3

12/30/2021
Prove: There exists a positive integer nn with 20212021 prime divisors, satisfying n∣2n+1n|2^n+1.
IMOCnumber theory