Matt’s at it again, posting puzzles on that Twitter:

Fun fact: you can arrange all the numbers from 1 to 17 so that each adjacent pair adds to a square number. Off you go! #mathspuzzle

— Matt Parker (@standupmaths) September 24, 2013

Plus a clarification:

To clarify: “each adjacent pair” means all but the end numbers are used twice. It’s every pair of neighbours as you go down the row.

— Matt Parker (@standupmaths) September 24, 2013

No spoilers in the comments please. Reply to Matt on Twitter!