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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?

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  • $\begingroup$ This is an easy one! $\endgroup$ May 16 '20 at 3:57
  • $\begingroup$ Then could you accept my answer :) $\endgroup$ May 16 '20 at 4:01
  • $\begingroup$ Yup, there's a countdown before I can accept :) $\endgroup$
    – Galen
    May 16 '20 at 4:02
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Relation:

All connected numbers are primes.

The path:

enter image description here

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