olymmath

HMMT 2019 U32

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For positive integers aa and bb such that aa is coprime to bb, define ord⁡b(a)\operatorname{ord}_{b}(a) as the least positive integer kk such that b∣ak−1b \mid a^{k}-1, and define φ(a)\varphi(a) to be the number of positive integers less than or equal to aa which are coprime to aa. Find the least positive integer nn such that

ord⁡n(m)<φ(n)10\operatorname{ord}_{n}(m)<\frac{\varphi(n)}{10}

for all positive integers mm coprime to nn.

Dataset text NuminaMath olympiads. Quoted with source.

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