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Greatest . . . 37 Smallest . . . 23
21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.
23 is the only prime number between 20 and 29.
The only prime n umber between 20 and 25 is 23.
There are 4 numbers that are prime between the number 10 and 20. They are 11, 13, 17, and 19.