Reversal formed by Repdigits of Base minus 1 by Addition and Multiplication/Historical Note
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Historical Note on Reversal formed by Repdigits of Base minus 1 by Addition and Multiplication
David Wells reports in Curious and Interesting Numbers of $1986$ that this result was discussed in Volume $10$ of Journal of Recreational Mathematics by D.Y. Hsu, but further corroborating evidence for this has not yet been found.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $18$