Creating a program to look for the largest prime number of a number

[ichabod801]

Please use python tags when posting code, see the BBCode link in my signature below for instructions. I did it for you this time.

I would both sets of factors at the same time. Start with two and go up. The first factor you find is guaranteed to be prime. Put that in the prime factors list. Then every factor you find is either evenly divisible by one of the prime factors, or another prime factor.