If you meant to ask what are the prime numbers between 21 and 53 inclusive, then it would be 23, 29, 31, 37, 41, 43, 47, 53
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(21+53)/2 = 37
Yes.
53
53
The number between 53 and 61 is 57. To find the number between two given numbers, you would typically calculate the average of the two numbers. In this case, (53 + 61) / 2 = 57.