29 and 31 are the pair of twin primes bertween 20 and 40.
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41 and 43 are only the pair of Twin primes between 40 and 50.
20 and 20.
The prime numbers between 20 and 40 are 23, 29, 31 and 37 that is 4 out of 20 or 1 to 5
23, 29, 31, 37
24, 28, 32, 36.