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All whole numbers between 1 and 400 (=20 square).
There are no whole numbers between 20 and 21. Only fractions or decimals exist between these two numbers. Whole numbers between 20 and 25 are 21, 22, 23, and 24.
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
2,3,5,7,11,13,17,19
All of them except 23 and 29 which are prime numbers