Period of Reciprocal of 729 is 81/Historical Note
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Historical Note on Period of Reciprocal of 729 is 81
According to David Wells, in his Curious and Interesting Numbers of $1986$, this observation was reported on by Victor Thébault, in volume $19$ of Scripta Mathematica.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $729$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $729$