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Call a number prime-looking if it is composite but not divisible by 2, 3, or 5.  How many prime-looking numbers are there less than 100?

 Nov 20, 2020
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I'm assuming that by prime-looking you mean any number that is NOT divisible by ALL three numbers [2, 3 and 5]. If that is correct, I can only think of 3 such numbers:

 

The numbers are: 49,  77   and  91

 Nov 20, 2020

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