Multiplicative Magic Square/Examples/Order 3/Smallest/Historical Note/Mistake
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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): $216$