import gmpy

def test(n):
    if (not gmpy.is_prime(n)) and n != 1:
        return False
    s = str(n)
    if len(s) == 1:
        return True
    for i in xrange(len(s)):
        if not test(int(s[:i] + s[i+1:])):
            return False
    return True

print filter(test, xrange(10000000))