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2 diagonal sums (Posted on 2016-04-26) Difficulty: 3 of 5
Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows:

 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

It can be verified that the sum of the numbers on the diagonals is 101.
What is the sum of the numbers on the main diagonals in a N by N spiral formed in the same way?
Source: Project Euler

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
SolutionsolutionCharlie2016-04-26 10:09:11
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