Multiplicative Magic Square/Examples/Order 3/Smallest/Historical Note/Mistake

Source Work

1986: David Wells: Curious and Interesting Numbers:

The Dictionary

$216$

1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary

$216$

Mistake

$216$ is the magic constant in the smallest possible multiplicative magic square, as discovered by Dudeney.

Dudeney only rediscovered a multiplicative magic square which had already been discovered by Georges Pfeffermann in $1893$, and in $1913$ by Harry A. Sayles.

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $216$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $216$