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What's My Number?

Puzzle 10

Difficulty:
Fun:
(based on 14 votes)

I am thinking of a whole number between 1 and 20, inclusive.
  • Either my number plus 4 is prime and my number minus 4 is not prime, or vice versa.
  • My number plus 4 and my number minus 4 also fit the above requirement.

What is my number?

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