def is_prime(num):
    if num < 2:
        return False
    for i in range(2, int(num**0.5) + 1):
        if num % i == 0:
            return False
    return True

def find_primes_starting_with_5():
    prime_numbers = []
    for num in range(500, 600):
        if is_prime(num):
            prime_numbers.append(num)
    return prime_numbers

# Display all prime numbers with 3 digits starting with 5
primes = find_primes_starting_with_5()
print("Prime numbers starting with 5 and having 3 digits are:", primes)