12, 14, 15, 16, and 18 are composite numbers
11, 13, 17, and 19 are prime numbers
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composite numbers between 11 and 21:12 14 15 16 18
The composite numbers between 11 and 19 are: 12 14 15 16 18 The other numbers, 11, 13, 17, and 19, are all prime.
13, 15
39
15 is a composite number - it can be divided by 3 and 5. 11, 13, 17 and 19 are all prime numbers, not composite.