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USAJMO 2011 Question 6

USAJMO · USAJMO 2011

Question 6

Consider the assertion that for each positive integer $n\geq2$,
the remainder upon dividing $2^{2^n}$ by $2^n-1$ is a power of $4$.
Either prove the assertion or find (with proof) a counterexample.

Proposed by Sam Vandervelde (credit in the supplied notes).