## Imo 1964-1

### Imo 1964-1

Prove that $n^4+4^n$ is not a prime for $n>1$

One one thing is neutral in the universe, that is $0$.

### Re: Imo 1964-1

This is really a nice problem!

"Inspiration is needed in geometry, just as much as in poetry." -- Aleksandr Pushkin

Please

Please

**install LaTeX fonts**in your PC for better looking equations,**learn****how to write equations**, and**don't forget**to read Forum Guide and Rules.- nafistiham
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### Re: Imo 1964-1

\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.