MathDB
RMO 2023 P1

Source:

October 29, 2023
number theoryRMO 2023SquaresDivisibility

Problem Statement

Let N\mathbb{N} be the set of all positive integers and S={(a,b,c,d)N4:a2+b2+c2=d2}S=\left\{(a, b, c, d) \in \mathbb{N}^4: a^2+b^2+c^2=d^2\right\}. Find the largest positive integer mm such that mm divides abcd for all (a,b,c,d)S(a, b, c, d) \in S.