The numbers 2, 3, 5, 7, 11, 13, 17 and 19 are prime.
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There are 9 prime numbers between 0 and 20: 1,2,3,5,7,11,13,17,19.
2,3,5,7,11,13,17,19
Eight of them.
15 prime numbers are between 0 and 50
The prime numbers 0-20 are 2, 3, 5, 7, 11, 13, 17, and 19.