On Distinct Residues of Factorials


Vladica Andrejić, Miloš Tatarević




We investigate the existence of primes $p>5$ for which the residues of $2!$, $3!$, \dots, $(p-1)!$ modulo $p$ are all distinct. We describe the connection between this problem and Kurepa's left factorial function, and report that there are no such primes less than $10^{11}$.