When 100/(p-1)=t in Z
1^100 + 2^100 + ... +(p-1)^100 = -1(mod p)
So, the primes are:
2,3,5,11, and... 101
Let be prime number:
Suppose so to every witch is co-prime to :
Now, suppose , and primitive root of .
hence, congruent modulo to in some order.
Prove by yourself now that: is also system of congruent modulo .