一个自然数是素数,且它的数字位置经过任意对换后仍为素数,刚称为绝对素数,例如:13。试找出所有二位绝对素数。-a natural number is a prime number, and its position after arbitrary figures for the number of after-still, just as absolute prime, For example : 13. Tried to find out all the two absolute prime.