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OPEN
Let $p$ be a prime and \[A_p = \{ k! \mod{p} : 1\leq k<p\}.\] Is it true that \[\lvert A_p\rvert \sim (1-\tfrac{1}{e})p?\]
#478
:
[ErGr80]
number theory
,
factorials
Additional thanks to
: Zachary Chase
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