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Pretty primes (Posted on 2017-04-10) Difficulty: 1 of 5
How any primes p exist such that
p4+1 is a prime number as well?

See The Solution Submitted by Ady TZIDON    
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Hints/Tips re: solution Comment 2 of 2 |
(In reply to solution by Daniel)

To simplify:  p^4+1 must be odd so p must be even.

There is only one even prime, i.e.  2.

Since 2^4+1=17  is prime number , 2 is the answer.

  Posted by Ady TZIDON on 2017-04-10 16:05:15
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