This problem is the latest from Polivka in Quote-Quad (though aimed at
APL). FWIW the answer is a cubic in the edge length.
Ralph Selfridge
On Sun, 2 Dec 2007, Roger Hui wrote:
FYI: Problem 28 in www.ProjectEuler.net is as follows:
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 both diagonals is 101.
What is the sum of both diagonals in a 1001 by 1001 spiral formed in the same
way?
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