003-largest-prime-factor.lhs

#!/usr/bin/env runhaskell

[Largest prime factor](http://projecteuler.net/problem=3)
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The prime factors of 13195 are 5, 7, 13 and 29.

What is the largest prime factor of the number 600851475143 ?


Code
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> import Data.Numbers.Primes

> main :: IO ()
> main = let result = last
>                   $ primeFactors 600851475143
>                   :: Integer
>        in print result


Answer
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    6857