Question 134
Find all triples of positive integers $(m, n, k)$ that satisfy the equation
$$
(m! + m)(n! + n) = (k! + k).
$$
$$
(m! + m)(n! + n) = (k! + k).
$$
MathNet 2019-part-07 — 184 problems (EN–VI) Question 134
Math Olympiad Vault · MathNet 2019-part-07 — 184 problems (EN–VI)