15, 13, 11, 9, 7, 5, 3, and 1.
Technically, also an infinite number of negative numbers.
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odd numbers less than 15: 1, 3, 5, 7, 9, 11,13
9 and 15 are the only two odd composite numbers less than twenty.
15 and 9 are both odd, composite numbers less than 20.
Assuming you mean the positive odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, 17 and 19.
The sum of the first 15 odd numbers is 225.