The numbers 5, 7, 11, 13, 17 and 19 are prime.
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2, 3, 5, 7, 11, 13, 17, 19 ARE prime numbers! 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20 are NOT prime numbers!
17
There are 4 numbers that are prime between the number 10 and 20. They are 11, 13, 17, and 19.
8: 1,2,3,5,7,13,17,19
11 13 17 19