Inspired by Project Euler n°28 et 58.
A n x n spiral matrix is obtained by starting with the number 1 and moving to the right in a clockwise direction.
For exemple with n=5, the spiral matrix is :
21 22 23 24 25 20 7 8 9 10 19 6 1 2 11 18 5 4 3 12 17 16 15 14 13
In this example, the sum of the numbers on the diagonals is 101.
What is the sum of the numbers on the diagonals in any n by n spiral (n always odd) ?
HINTS: You want the diagonals, not the whole matrix.
Create a cell array out of a struct
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Replace multiples of 5 with NaN
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