Martin Gardner, The Magic Numbers of Dr. Matrix, p18
Dorset Press, 1985
F=2, O=9, R=7, T=8, Y=6, E=5, N=0, S=3, I=1, X=4.
71537194
Martin Gardner, The Magic Numbers of Dr. Matrix, p18
Dorset Press, 1985
F=2, O=9, R=7, T=8, Y=6, E=5, N=0, S=3, I=1, X=4.
71537194