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USAMO 2025 — Days 1 and 2 Question 1

USAMO · USAMO 2025 — Days 1 and 2

Question 1

Fix positive integers $k$ and $d$.
Prove that for all sufficiently large odd positive integers $n$,
the digits of the base-$2n$ representation of $n^k$ are all greater than $d$.

Proposed by John Berman.

Manual essay; 1 editorial point, not official contest scoring. Automatic answer fields are intentionally empty.