There are four. 23,29,31,37
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There are two prime numbers between 20 and 30 which are 23 and 29
Eight of them.
The prime numbers between 20 and 30 are 23 and 29.
There are 9 prime numbers between 0 and 20: 1,2,3,5,7,11,13,17,19.
7 different numbers.35711131719