Penny has announced the winners of the witch contest and my two favourites weren't amongst them... so now I'll never know who did them... unless someone tells me....
my absolute favourite was the dark 68 and my favourite cute one was the tortoise 138.
Anyone know???
Update: the tortoise is by happy d
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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