prime(n):
    If n <= 1, return False.
    If n <= 3, return True.
    If n%2 == 0 or n%3 == 0, return False.
    Iterate from i = 5 to the sqrt(n):
        If n%i == 0 or (n+2)% == 0, return False.
    If none, return True.

find_prime_numbers():
    Store prime numbers in a list.
    Iterate over numbers from 500 to 600 -exclusive-:
        If the first digit of the number is '5' and the number is prime, add it to the list.
    Return the list.