GWD 10-31
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)
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為什麼不是B呢? 98的最大質因數是7吧?