Bordered squares with separation by parity

Abstract

This admirable construction also involves bordered squares, but where the odd numbers are all placed in an oblique square with its corners at the middle of each side of the main square and the even numbers around it (Fig. 276). This configuration naturally occurs in the square of order 3 (Fig. 277), which certainly led to the search for an analogous configuration in odd squares of higher orders, which is by no means an easy matter.