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Mathematics 21 Online
OpenStudy (mathmagician):

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

OpenStudy (anonymous):

|dw:1331492982634:dw|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

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