13, 15
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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.
12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers
Composite numbers in the list: 4, 6, 8, 9. 10. 12 Prime numbers in the list: 2, 3, 5, 7, 11
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