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How many positive integers less than 70 have an even amount of positive divisors?

 Jan 16, 2020
 #1
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+1

Sorry CPhill: I misread the question!!.

 Jan 16, 2020
edited by Guest  Jan 16, 2020
 #3
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No prob........I do it all the time....LOL!!!

 

 

 

cool cool cool

CPhill  Jan 16, 2020
 #2
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+1

All   squares have an odd number of divisors

 

The squares  from  1 to  70   are

 

1, 4, 9, 16, 25, 36, 49 ,64  =  8 squares

 

So

 

70 - 8  =

 

62  positive integers less than 70  have an  even number of divisors

 

 

cool cool cool

 Jan 16, 2020

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