IOM 2021, Блиц — Задача 61

The Blitz-contest of IOM-2021

Условие

A positive integer $n$ is said to be digitious if it is a $9$-digit number such that each digit $1$, $2$, …, $9$ appears exactly once. Find the largest digitious number such that the sum of any two adjacent digits is a multiple of either $5$, $7$ or $11$.

Отговори

Решение

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Оригинал в Архива: iom-2021-blitz-tasks-eng.pdf · официални решения: iom-2021-blitz-answers-eng.pdf