Question

Show that the number
n^4 + 4^n
is not prime for any positive integer n ≥ 2.

Answer 1

Okay.
This can be done by factorizing it.
And obiously n is dd otherwise two would be n immediate factor.
Therefore 2^(n+1)/2 is defined.
Which => it is a product of two integers.
Hence not prime. :D