SOLUTION: What is the smallest positive integer p for which 2^2p + 1 is not a prime number?

SOLUTION: What is the smallest positive integer p for which 2^2p + 1 is not a prime number?

Algebra.Com

Question 307512: What is the smallest positive integer p for which 2^2p + 1 is not a prime number?
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Let p=1, 2^2+1= 5 which is prime.
Let p=2, 2^4+1=17 which is prime.
Let p=3, 2^6+1=65 which is NOT prime.

The smallest positive integer p is 3.

Dr. Robert J. Rapalje, Retired
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