They are: 31, 37, 41 and 43
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There are two prime numbers between 20 and 30 which are 23 and 29
There are two prime numbers between 30 and 40 - these are 31 and 37.
two numbers (31,37)
23 and 29 are the only two numbers that fall between 21 and 30
They are 31 and 37.