MathDB
What happens if d is negative?

Source:

October 23, 2024
Chilecombinatorics

Problem Statement

On a table, there are many coins and a container with two coins. Vale and Diego play the following game, where Vale starts and then Diego plays, alternating turns. If at the beginning of a turn the container contains n n coins, the player can add a number d d of coins, where d d divides exactly into n n and d<n d < n . The first player to complete at least 2024 coins in the container wins. Prove that there exists a strategy for Vale to win, no matter the decisions made by Diego.