gen_prime.py

#coding:utf-8

import random

def is_prime(n):
    i = 2
    while i * i <= n:
        if n % i == 0:
            return False
        i += 1
    return True

def main():
    while True:
        r = random.randint(2 ** 29, 2 ** 31)
        if is_prime(r):
            print r
            break

if __name__ == "__main__":
    main()