# the number 1 +(n)! is perfect square for the vlues of n=4,5,7. find the other values of n. (factorial is only for n)

Arun Kumar IIT Delhi
8 years ago
This isBrocard's problem and it's still open.

as far as now only 3 solution are known
$n!+1=m^2 \\(n,m)=(4,5),(5,11),(7,71)$

Arun Kumar
IIT Delhi