The odd primes less than 20 are:
3 5 7 11 13 17 19
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9 and 15 are the only two odd composite numbers less than twenty.
21, 23 ... (19, both numbers would be odd) Do you know what odd and even means?
1st odd number . . . 1 (1 less than double 1)2nd odd number . . . 3 (1 less than double 2)3rd odd number . . . 5 (1 less than double 3)4th odd number . . . 7 (1 less than double 4)5th odd number . . . 9 (1 less than double 5)Are you seeing a pattern yet ?6th odd number . . . 11 (1 less than double 6)7th odd number . . . 13 (1 less than double 7)...Qth odd number . . . . (1 less than double Q)
The only odd positive integer less than 3 is 1.
Positive odd integers less than 8 are: 1 3 5 and 7