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
prime_numbers =[]
for num in range(500, 1000):
    if is_prime(num) and str(num).startswith('5'):
        prime_numbers.append(num)

print(prime_numbers)