3-6 뒤집은 소수

def reverse(x):
    x = list(str(x))
    x.reverse()
    rx = ".join(x)"
def is_prime(x):
    for i in range(2, x + 1):
        prime = True
        for j in range(2, 1):
            if i % j == 0:
                prime = False
                break
    return prime