There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can participate in the path no more than once. What is the relation and the path it induces?

Previous

• Follow the path of relation through the grid #1
• Follow the path of relation through the grid #2
• Follow the path of relation through the grid #3
• Follow the path of relation through the grid #4

Hint 1

The relation is inspired by a Project Euler puzzle.

Hint 2

The relation pertains to whether adjacent numbers are part of the same triplet.