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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12
1 is special 2 prime 3 prime 4 composite 5 prime 6 composite 7 prime 8 composite 9 composite 10 composite 11 prime 12 composite ext.
composite numbers between 11 and 21:12 14 15 16 18
12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers
no 2 is not a composite number 4,6,8,10,12 are composite numbers