Fill numbers from 1 to 9 so that every row , column and diagonally add up to 15 .You can use no. 1 to 9 only once.
The square of 13 is 169. Take the last digit of the square, 9, and place it in the middle, making 196. This is the square of 14, the next number above 13. What are the next numbers which also have this property?
