The numbers 2, 3, 5, 7, 11, 13, 17 and 19 are prime.
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The prime numbers between 0 and 20 are: 2, 3, 5, 7, 11, 13, 17 and 19
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
2/5 of the numbers from 1 to 20 are prime numbers
There are no negative prime numbers.
The prime numbers between 10 and 20 are 11, 13, 17, and 19.