Definition:Brown Numbers

Definition
Brown numbers are pairs of integers $\left({m, n}\right)$ such that:
 * $n! + 1 = m^2$

There are only $3$ known such pairs:
 * $\left({5, 4}\right)$
 * $\left({11, 5}\right)$
 * $\left({71, 7}\right)$

Also see

 * Brocard's Problem