It can be: (5*6)-21 = 28
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22, 28, 82 and 88.
((7-2) * 4) + 8 = (5 * 4) + 8 = 20 + 8 = 28
28 is not a prime number because it is divisible by 2, 4, 7, and 14. Prime numbers are only divisible by 1 and themselves without any other factors.
28/42
7, 14, 28, 56, 903