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CIIM 2024 Problem 6

  • Day 2

Dado un número real xx, se define la serie

S(x)=∑n=1∞{n!⋅x},S(x) = \sum_{n=1}^{\infty} \{n! \cdot x\},

donde {s}=s−⌊s⌋\{s\} = s - \lfloor s \rfloor es la parte fraccionaria del número ss. Determinar si existe algún número irracional xx para el cual S(x)S(x) converge.

Official text Iberoamerican Interuniversity Mathematics Competition 2024 official paper, page 1. Quoted with source.

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