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CIIM 2024 Problem 3

  • Day 1

Dado un entero positivo nn, sea ϕ(n)\phi(n) el número de enteros positivos menores o iguales que nn que son primos relativos con nn. Hallar todos los posibles enteros positivos kk para los cuales existen enteros positivos 1<a1<a2<⋯<ak1 < a_1 < a_2 < \cdots < a_k tales que:

⌊ϕ(a1)a1+ϕ(a2)a2+⋯+ϕ(ak)ak⌋=2024.\left\lfloor \frac{\phi(a_1)}{a_1} + \frac{\phi(a_2)}{a_2} + \cdots + \frac{\phi(a_k)}{a_k} \right\rfloor = 2024.

Nota: La función ⌊x⌋\lfloor x \rfloor denota al mayor entero menor o igual que xx.

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

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