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How many natural numbers between 1 and 10 can be represented as the product of two or more prime factors?

 Apr 10, 2021
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Primes of concern   2 3 5 7

  2 *2 = 4

2 * 2 * 2 = 8

2 * 3 = 6

3 * 3 = 9         looks like four

 

 

IF you include 10   there is one more    2 * 5 = 10

 Apr 10, 2021
edited by ElectricPavlov  Apr 10, 2021

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