olymmath

OMCC 2015 Problem 4

  • Day 2

Anselmo and Bonifacio start a game where they alternatively substitute a number written on a board. In each turn, a player can substitute the written number by either the number of divisors of the written number or by the difference between the written number and the number of divisors it has. Anselmo is the first player to play, and whichever player is the first player to write the number 00 is the winner. Given that the initial number is 10361036 , determine which player has a winning strategy and describe that strategy.

Note: For example, the number of divisors of 1414 is 44 , since its divisors are 11 , 22 , 77 , and 1414 .

Dataset text AI-MO AoPS. Quoted with source.

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