It is: 37
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The middle number is 37
It is 37 because as a prime number it has only two factors which are itself and one
35, 36, 38, 39, 40, 42, 44, 45.
It is 37
These are the composites between 31 and 41: 32, 33, 34, 35, 36, 38, 39, 40.