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How many of the numbers from the set \(\{1,\ 2,\ 3,\ldots,\ 50\}\) have a perfect square factor other than one?

 Dec 6, 2018
 #1
avatar+18839 
+1

I think you mean

4 9 16 25 36 49         Six

 Dec 6, 2018
 #2
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+1

I count 18 which have at least 1 perfect square as a factor or divisor:

(4, 8, 9, 12, 16, 18, 20, 24, 25, 27, 28, 32, 36, 40, 44, 45, 48, 50)

 Dec 6, 2018
 #3
avatar+25 
+2

Don't forget 49

HelloWorld  Dec 6, 2018
 #4
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+1

Right. Thanks.

Guest Dec 6, 2018

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