The next four composite numbers after 30 are 32, 33, 34 and 35.
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The composite numbers between 20 and 30 are: 20 21 22 24 25 26 27 28 30
The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.
The composite numbers between 30 and 40 are 32, 33, 34, 35, 36, 38, and 39.
30 and 135 are composite numbers. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
All even numbers other than 2 are composite, so the even composite numbers between 30 and 50 are 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, and 50.