import math

# print all the prime numbers which have 3 digits and start with 5
def list_primes():
    
    for i in range(501, 600, 2):
        prime = True
        for divisor in range(2, int(math.sqrt(i)) + 1):
            if i % divisor == 0:
                prime = False
                break
        if prime:
            print(i)