25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45
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These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
23, 25, 27, 29
All the numbers above 2 that are the squares of odd primes have exactly 3 factors: 1, the odd prime, and the odd prime squared. 4, 9, 25, 49, 81, 121,...
The odd composite numbers lower than 30 are:9 15 21 25 27
There are thirteen (13) odd numbers between 14 and 40. They are: 15 17 19 21 23 25 27 29 31 33 35 37 39