Q31:
A positive integer n is said to be “prime-saturated” if the product of all the different positive prime factors of n is less than the square root of n.  What is the greatest two-digit prime-saturated integer?

A.    99
B.    98
C.    97
D.    96
E.    95
Answer:

答案选D  我选B
98的prime factor 1和7   < square root of  98 啊~

来人指导指导啊！