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IKMC 2008 - Grades 9-10 - Self-study Question 17

IKMC · IKMC 2008 - Grades 9-10 - Self-study

Question 17

How many primes p also make $p^4+1$ prime?
  1. None
  2. 1
  3. 2
  4. 3
  5. Infinitely many