They are: 30 32 33 34 35 36 38 39 and 40
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30, 32, 33, 34, 35, 36, 38, 39, 40
The composite numbers between 30 and 40 are 32, 33, 34, 35, 36, 38, and 39.
The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.
All even numbers are composite, because 2 is a factor of every even number.