说明：  求九位累进可除数。所谓九位累进可除数就是这样一个数： 这个数用到1到9这九个数字组成，每个数字刚好只出现一次。这 九个位数的前两位能被2整除，前三位能被3整除......前N位能 被N整除，整个九位数能被9整除
(for nine Polydivisible number. The so-called nine Polydivisible number is a number : the number used it 1-9 nine figures, each figure has only occur once. Nine of the median two previous Divisible be two, the first three can be divisible ...... 3 before the N-N can be divisible, the whole nine median be divisible 9)