Math Problem of the Week #12

How many whole numbers between 1 and 100 have 5 factors?

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2 thoughts on “Math Problem of the Week #12

  1. Well numbers of the form p^n where p is prime have n+1 factors which are: 1,p,p^2,…,p^n
    So you have all the numbers which are of the form p^4 where p is prime.
    which is 2^4=16 and 3^4=81

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