The prime numbers are 2, 3, and 7. They are the ones that have no factors other than 1 and the number itself.
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13
The numbers between 10 and 20 that are not prime are 12, 14, 15, 16 and 18. So 15 is the odd number and the rest are even numbers.
It is 17.
17,19,23,29
17... and 19 !