rearrange numbers 1 - 60 - All-Russian MO 2002 Regional (R4) 9.5
Source:
September 17, 2024
number theorycombinatorics
Problem Statement
Is it possible to arrange the numbers in that order, so that the sum of any two numbers between which there is one number, divisible by , the sum of any two numbers between which there are two numbers divisible by , . . . , the sum of any two numbers between which there is are there six numbers, divisible by ?