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IKMC 2019 - Grades 11-12 - Set 2 - Self-study Question 26

IKMC · IKMC 2019 - Grades 11-12 - Set 2 - Self-study

Question 26

For how many integers $n$ is $|n^2-2n-3|$ prime?
  1. 1
  2. 2
  3. 3
  4. 4
  5. Infinitely many