n numbers 1s and 2s in a circle - All-Russian MO 2001 Regional (R4) 8.2
Source:
September 25, 2024
algebranumber theory
Problem Statement
numbers - ones and twos - are arranged in a circle. We mean a number formed by several digits arranged in a row (clockwise or counterclockwise). For what is the smallest value of , all four-digit numbers whose writing contains only numbers and , could they be among those shown?