The prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
The original answer incorrectly included 1, 9, and 15.
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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
The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
There are 8 prime numbers between 1 and 20. The numbers are 2, 3, 5, 7, 11, 13, 17, and 19.
Prime numbers only have factors of 1 and themselves: 23, 29