15 numbers:
21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39
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There is no "THE" composite number. It could be any one of 501, 502, 504, 505, plus many more.
All of them except for 23 which is a prime number
Five.
There are 18.
there are 4. 11,13,17,19