def solution_1():
num = 647
while True:
if (
len(prime_factors(num)) == 4
and len(prime_factors(num + 1)) == 4
and len(prime_factors(num + 2)) == 4
and len(prime_factors(num + 3)) == 4
):
break
num += 1
print num
import os
import sys
sys.path.append(os.path.abspath(".."))
import factor as ft
pf = ft.prime_factors(600851475143)
print pf[-1][0]