olymmath

HMMT 2020 A5

  • Algebra and Number Theory
  • Answer

A positive integer NN is piquant if there exists a positive integer mm such that if nin_{i} denotes the number of digits in mim^{i} (in base 10), then n1+n2+⋯+n10=Nn_{1}+n_{2}+\cdots+n_{10}=N. Let pMp_{M} denote the fraction of the first MM positive integers that are piquant. Find lim⁡M→∞pM\lim _{M \rightarrow \infty} p_{M}.

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{32}{55}

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