4=2*2
6=2*3
8=2*2*2
9=3*3
10=2*5
12=2*2*3
14=2*7
15=3*5
16=2*2*2*2
18=2*3*3
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29 is prime, all the others in the list are composite.
9 and 15 only.
The composite numbers that are between 1 and 20 inclusive are: 4 6 8 9 10 12 14 15 16 18 20 This is a total of eleven composite numbers equal to 20 and below.
The composite numbers between 10 and 20 are 12, 14, 15, 16 and 18.
There are 7 composite numbers from 10 to 20 (including the boundaries):10, 12, 14, 15, 16, 18 and 20