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IKMC 2009 - Grades 11-12 - Paper 02 - Self-study Question 3

IKMC · IKMC 2009 - Grades 11-12 - Paper 02 - Self-study

Question 3

For how many positive integers $n$ is $n^2+n$ prime?
  1. 0
  2. 1
  3. 2
  4. A finite number greater than 2
  5. Infinitely many