MathDB
n numbers in a circle, digits - All-Russian MO 1999 Regional (R4) 9.1

Source:

September 25, 2024
number theoryDigits

Problem Statement

All natural numbers from 11 to NN, N≥2 N \ge 2 are written out in a certain order in a circle. Moreover, for any pair of neighboring numbers there is at least one digit appearing in the decimal notation of each of them. Find the smallest possible value of NN.
Back to ProblemsView on AoPS