23, 29, 31, 37, 41, 43 and 47
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2,3,5,7,11,13,17,19
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
11,13,17 and 19
The prime numbers between 20 and 30 are 23 and 29.
All of them except 23 and 29 which are prime numbers