Problem 2644. The Ulam Matrix
The Ulam spiral is simple to describe. On a gridded piece of paper, write down the number 1. Then write successive integers as you spiral out in a counter-clockwise fashion. For example:
17 16 15 14 13 18 5 4 3 12 19 6 1 2 11 20 7 8 9 10 21 22 23 24 25
Although you can stop writing numbers at any time, for the purpose of this problem let's assume you want to fill an N x N square matrix with numbers from 1 to N^2.
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1 Comment
Mattias
on 3 Jan 2015
Nice problem! At least if you don't use MATLAB's existing function for this.
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