Alphamagic square
Magic square with extra constraints / From Wikipedia, the free encyclopedia
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An alphamagic square is a magic square that remains magic when its numbers are replaced by the number of letters occurring in the name of each number. Hence 3 would be replaced by 5, the number of letters in "three". Since different languages will have a different number of letters for the spelling of the same number, alphamagic squares are language-dependent.[1] Alphamagic squares were invented by Lee Sallows in 1986.[2][3]