Project Euler Problem 3
問題
The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ?
ソース
require 'mathn' x = 600851475143 pv = x.prime_division p pv[pv.size - 1][0]
解答
6857
感想
ライブラリ使って余裕!
The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ?
require 'mathn' x = 600851475143 pv = x.prime_division p pv[pv.size - 1][0]
6857
ライブラリ使って余裕!