Problem K. 475. (November 2015)
K. 475. In the fields in the table (see the figure), enter the integers 1 to 15 so that the sum of the two numbers in any two adjacent field is a perfect square.
(6 pont)
Deadline expired on 10 December 2015.
Statistics:
159 students sent a solution.  
6 points:  95 students. 
5 points:  23 students. 
4 points:  17 students. 
3 points:  17 students. 
0 point:  5 students. 
Unfair, not evaluated:  2 solutions. 
