prep模考题

crystal_10 · 发表于 2018-10-30 14:49:32

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?

99
98
97
96
95正确答案是96，为啥我觉得答案错了是98呢？

spicytaco · 发表于 2018-10-30 15:20:38

98=2*7*7 所以所有质数之积为2*7 = 14 远大于根号98

96=2*2*2*2*2*3 为2*3=6 远小于根号96

prep模考题

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