If an integer has the following three properties at the same time: the difference between the number 1 and 1 is a prime number; the quotient of the number 2 divided by 2 is also a prime number; the remainder of the number 3 divided by 9 is 5. We call this integer a lucky number, so what is the largest lucky number among two-digit numbers.
如果某整数同时具备如下三条性质：1这个数与1的差是质数；2这个数除以2所得的商也是质数；3这个数除以9的余数是5．我们称这个整数为幸运数，那么在两位数中，最大的幸运数是多少．
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