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2023 China TST Problem 13

Source: 2023 China TST Problem 13

March 27, 2023
number theory

Problem Statement

Does there exists a positive irrational number x,{x}, such that there are at most finite positive integers n,{n}, satisfy that for any integer 1kn,1\leq k\leq n, {kx}1n+1?\{kx\}\geq\frac 1{n+1}?