Long primes up to 27

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 4 long primes smaller than 27.

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

7, 17, 19, 23

• Learn more about Long primes.
• All long primes