The composite (non-prime) numbers are:
6, 8, 9, 10, 12,
14, 15, 16, 18,
20, 21, 22, 24,
25, 26, 27, and 28.
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All of them except 23 and 29 which are prime numbers
The only prime number in that range is 29. All others are composite.
All of them except for 29 and 31 which are prime numbers
All of them except 23 and 29 which are prime numbers having only two factors
There are 83 composite numbers.