Composite numbers are positive integers greater than 1 that have more than two distinct positive divisors. The composite numbers less than 30 are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, and 28. These numbers can be divided evenly by numbers other than 1 and themselves.
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There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
The odd composite numbers lower than 30 are:9 15 21 25 27
21 22 24 25 26 27 28
composite numbers 30-40
11, 13, 17, 19, 23, 29 are the primes between 10 and 30 so the composite numbers are all the others. 12,14,15,16,18,20,21,22,24,25,26,27,28, and 30 are the composite numbers between 10 and 30.