[数学] Prep数学第20题编号2942-!-item-!-187;#058&003104

robert

lzllfz问道：

For any positive integer n, the length of n is defined as the number of prime factors whose product is n. For example, the length of 75 is 3, since 75 = 3 x5x5. How many two digit positive integers have length 6?

A)None
B)One
C)Two
D)Three
E)Four

2*2*2*2*2*2

2*2*2*2*2*3

2*2*2*2*3*1

2*2*2*2*2*1......这么往下多了去了 这题问题出在哪里？？

我的解答：

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