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Re: Fast Modular Factorial?



I find that for the numbers I have tried, that (p-1)! mod p = (p-1) if
p is prime, else it equals 0, with one exception (p=4).  So if this
is true (probably a standard result; it sounds familiar) then it might
actually be easier to find the factorial of a larger number mod a
prime than a smaller one.
Hal