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MathNet 2022-part-04 — 197 problems (EN–VI) Question 137

Math Olympiad Vault · MathNet 2022-part-04 — 197 problems (EN–VI)

Question 137

Do there exist positive integers $m$ and $n$ such that the decimal representation of $5^m$ starts with $2^n$ and the decimal representation of $2^m$ starts with $5^n$?