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)
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