The code returns the correct value on every value of x except for x = 9.
Oops, try again. Your function fails on is_prime(9). It returns True when it should return False.
the function works correctly for all other values. Prime numbers like 2, 5 or 11 or 521 return True like they should and non prime numbers like 4 or 18 return False like they should. It is just 9 That doesn't work for as far as I can tell.
def is_prime(x): if x <= 1: return False elif x <= 3: return True else: for n in range(2,x): if x % n == 0: return False else: return True