4, 6, 8, 9, 10, 12, 14, 15, 16, and 18
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Composite numbers less than 20 are 4, 6, 8, 9, 10, 12, 14, 15, 16 and 18.
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
18 and 20
there are 4. 11,13,17,19
All of them except for 23 which is a prime number