Hopping grasshoppers
Source: Tournament of Towns Spring 2017 Junior A-level
January 30, 2018
combinatoricsRussia
Problem Statement
A grasshopper can jump along a checkered strip for or cells in any direction. A
natural number is called jumpable if the grasshopper can start from some cell of a strip of
length and visit every cell exactly once. Find at least one non-jumpable number .(Egor Bakaev)