1, 2, 3, 5, 7, 11, 13, 17, 19
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There are eight prime numbers under 20.
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 10 and 20 are 11, 13, 17, and 19.
7 + 13 = 20 Note that there are no two prime numbers x and y that multiply to 20.