Q31:
A positive integer n is said to be "prime-saturated" if the product of all the different positive prime factor 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
Ans: D
請教這題要如何解?
直接從選項作因式分解驗證實在太慢了
有更快的方法麼?