Unswop the pairs of numbers to bring back the magic
In squares of this type, containing a consecutive sequence 1 to ?, the magical expression to produce the constant is always (n3+n) divided by 2. So in our 4x4 square, the expression gives 64+4=68, 68/2=34 for the constant. The two pairs swopped over were 14 & 9, and 13 & 5. The original square was thus:
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This was first published in October 2006