This library help to find prime numbers between given range

"Circular Prime" program in python

197 is an example of a circular prime, because its rotations 197, 971 and 719 are also prime. There are 13 circular primes below 100: 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79 and 97. The aim is to find the number of circular primes below a certain number (e.g. 1000000).