There are only 3 numbers to test if they are prime, that isn't very hard.
You can also use the list of 1000 smallest primes.
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The prime number that is greater than 20 but less than 29 is 23.
It could be 97 which is a prime number.
12 can be greater or smaller than a prime number. It depends on the number you select.
70
It is 43