Re^2: Spiraling integers

in reply to Re: Spiraling integers
in thread Spiraling integers

Easy, just subtract every number from n**2 + 1. See, here's the original spiral:

1 2 3
8 9 4
7 6 5
[download]

We subtract it from 10,

10-1 10-2 10-3
10-8 10-9 10-4
10-7 10-6 10-5
=
9 8 7
2 1 6
3 4 5
[download]

Also note that in my J solution, all you have to do is to change the /: operator to \:. Can you do this with a one-charater change to any other existing solutions? :)

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In Section Cool Uses for Perl