11, 13, 15, 17, 19, 21, 23
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There are 25 of them.
Square numbers 16, 25, 36, 49, 64, 81, 100
101
They are: 19 21 23 and 25
There are not THAT many odd numbers between 20 and 25. If you include the extremes, you have 21, 23, and 25. Try each one of them, and see which is a multiple of 3.