I've turned comments off on this blog as I'm getting quite a lot of spam. I've been able to keep on posting on flickr but haven't the time and energy to manage to be an active blogger. Sorry not to have been visiting your blogs.
My best wishes to you all!
Update: Comments are back on and I'm back!
Enigma 749: Four square digits
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From New Scientist #1904, 18th December 1993 [link] Here is a four-by-four
square of numbers. You will see that each row and each column adds up to
the sam...
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