A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 * 99.Find the largest palindrome made from the product of two 3-digit numbers. 訳 「回文数」とは右から読んでも…

一週間，追記できなかったので，2008-03-23 - dachs_hippoの日記を仕切りなおし． The prime factors of 13195 are 5, 7, 13 and 29.What is the largest prime factor of the number 600851475143 ? 訳 13195の素因数は5，7，13，29である．600851475143の…