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The magic hexagon was found in 1895 after much trial and error by William Radcliffe [radcliffe].

In 1963, Charles Trigg [trigg] proved that it is the only magic hexagon of any size (other than the trivial diameter 1) using a constraint on the sum of any diagonal.

See the related magic square and sequence problem entry.

[trigg]

Charles Trigg
howpublished: http://mathworld.wolfram.com/MagicHexagon.html

[radcliffe]

William Radcliffe
howpublished: http://www.johnrausch.com/PuzzleWorld/magichex.htm