Question 184
Find all pairs of positive integers $(a, b)$ such that
$$
a! + b! = a^{b} + b^{a}
$$
$$
a! + b! = a^{b} + b^{a}
$$
MathNet 2015-part-03 — 191 problems (EN–VI) Question 184
Math Olympiad Vault · MathNet 2015-part-03 — 191 problems (EN–VI)