This is the problem number four in the Project Euler which reads:
The prime factors of 13195 are 5, 7, 13 and 29.
What is the largest prime factor of the number 600851475143 ?
My own solution to resolve this problem is the following:
def primeFactors(n): factors= d=2 while(d*d<=n): while(n>1): while n%d==0: factors.append(d) n=n/d d+=1 return factors[-1] print primeFactors(600851475143)
And the correct answer to this problem is: 6857