12
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12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers
None of the numbers 7, 11, and 13 are composite numbers; they are all primes.
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
It is 15