This number is a composite.
4296 2490869760
The first integer n such that n±1, n/2±1, n/3±1, n/4±1, and n/5±1 are all prime. [Graham]
The first integer n such that n±1, n/2±1, n/3±1, n/4±1, and
n/5±1 are all prime. [Graham]