Is there integer $n>3$ such that both $n!-1$ and $n!+1$ are prime?
For $n=3$ we know that $5=3!-1$ and $7=3!+1$ are prime.
Is there integer $n>3$ such that both $n!-1$ and $n!+1$ are prime?
For $n=3$ we know that $5=3!-1$ and $7=3!+1$ are prime.
Copyright © 2021 JogjaFile Inc.