Find largest N

Number Theory Level pending

Find the largest integer n such that

4^27 + 4^1000 + 4^n

Is a Square


The answer is 1972.

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1 solution

Ray Ex
May 18, 2015

4^27+4^1000+4^n=4^26(4+4^974+4^n-26), n=((974-1)*2)+26

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