Arrange the numbers 1 to 15 inclusively in a straight line in such a way that any two adjacent numbers add up to a perfect square.
*** Disregard reflections.
Write down pairs that sum to squares
Note that 8 and 9 appear just once, so they must be the ends. The must be the endpoints.
Only 1 and 3 appear thrice so there will only be one or two decision points.
Posted by Jer
on 2013-05-20 12:29:32