Long primes up to 20

Long primes: Long prime in base b is a prime number p such that the formula (b^(p-1)-1)/p (where p does not divide b) gives a cyclic number.

There is 3 long primes smaller than 20.

Checkout long primes up to: 100, 500, 1000, 10000.


7, 17, 19


1 - 371719
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