Anomalous Cancellation on 2-Digit Numbers/Historical Note
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Historical Note on Anomalous Cancellation on 2-Digit Numbers
According to David Wells in his $1986$ work Curious and Interesting Numbers, this result, as well as some others, was demonstrated by Alfred Moessner in Volumes 19 and 20 of Scripta Mathematica, but it has proven difficult to find an archived copy to consult directly.