Armstrong数具有如下特征：一个n位数等于其个位数的n次方之和。如：

153＝13＋53＋33

1634＝14＋64+34+44

找出2、3、4、5位的所有Armstrong数。-Armstrong number has the following characteristics: a n digits equal to its n-th power, and in the single digits. Such as:

153 = 13+53+33

1634 = 14+64+34+44

Find out all Armstrong number 2,3,4,5 bit.