Y by Lcz, ImSh95, megarnie
Find all positive integers
for which it is possible to color some cells of an infinite grid of unit squares red, such that each rectangle consisting of exactly
cells (and whose edges lie along the lines of the grid) contains an odd number of red cells.
Proposed by Merlijn Staps


Proposed by Merlijn Staps
This post has been edited 1 time. Last edited by john0512, Jun 26, 2023, 4:00 PM