They are all prime numbers except for 15 21 25 and 27 which are composite numbers
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The prime numbers between 10 and 20 are 11, 13, 17, and 19.
The first 15 prime numbers are 2, 3, 5, 7, 11 ,13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.
1 17 and 13 are prime numbers
The prime numbers from 1 to 17 are 2, 3, 5, 7, 11, 13, and 17.
The numbers 11, 13, 17 and 19 are prime.