11 13 17 19
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The numbers 11, 13, 17 and 19 are prime.
The numbers 5, 7, 11, 13, 17 and 19 are prime.
The prime numbers 0-20 are 2, 3, 5, 7, 11, 13, 17, and 19.
The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
The odd prime numbers less than 20 are 3, 5, 7, 11, 13, 17, and 19.