The composite numbers between 50 and 80 are:
50, 51, 52, 54, 55, 56, 57, 58, 60
62, 63, 64, 65, 66, 68, 69, 70, 72
74, 75, 76, 77, 78, 80
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All even numbers between 50 and 80 are composite.
The composite numbers between 70 and 80 are 72, 74, 75, 76, 77 and 78.
prime numbers between 50 and 80 = 53,59,61,67 ,71,73,79
81, 82, 84, 85, 86, 87, 88. 80 and 90 are composite too
All of them except for 83, 89 and 97 which are prime numbers