60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78
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79
The prime numbers between 51 and 80 are: 53, 59, 61, 67, 71, 73 and 79
The prime numbers between 50 and 100 are 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.
The numbers 53, 59, 61, 67, 71, 73 and 79 are prime.
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.