i rthink it is 7 and 5
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2 and 3 are the first two prime numbers. The difference between them is 1
Any prime numbers greater than 2 will be odd numbers. The difference between two odd numbers will be an even number. So, the difference between two prime (and odd) numbers could be 2, 4, or 6, of the numbers given. The difference could not be 3, 5, or 7.
43 and 17.
The maximum difference is 8, between 89 and 97.
The difference between prime and composite numbers is simple. Prime numbers have only two factors, 1 and itself. Composite numbers are divisible by more than two numbers