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Any Prime number (excluding 2 and 3 of course) would do, since these are not divisible by any number except 1 and itself.

So 5,7,11,13,...

Or products of prime numbers (again without 2 and 3)

For example

5*5=25

5*7=35

5*5*7=175

etc.

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Q: Which number serves as a counterexample all positive integers are divisible by 2 or 3?
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