5 and 37 are prime. 12 and 18 are composite.
The first 12 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, and 21.
12, 14, 15, 16.
composite numbers between 11 and 21:12 14 15 16 18
The composite factors of 72 are 4, 6, 8, 9, 12, 18, 24, 36, 72
5 and 37 are prime. 12 and 18 are composite.
The composite numbers between 11 and 19 are 12, 14, 15, 16 and 18
4, 6, 9, 12, 18, 36 are the composite factors of 36
The composite factors of 36 are 4, 6, 9, 12, 18, 36
18 is composite.
18. The first ten composite numbers are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
The first 12 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, and 21.
They could be 12 and 18
4, 6, 9, 12, 18, 36
12, 14, 15, 16.
12, 14, 15, 16, 18, 20, 21, 22
The composite numbers between 10 and 20 are 12, 14, 15, 16 and 18.