Perfect Digital Invariant/Examples/4150/Historical Note

Historical Note on Perfect Digital Invariant/Examples/4150

In his Curious and Interesting Numbers, 2nd ed. of $1997$, David Wells attributes this result to a certain Lehning, but gives no context.

It remains to identify who this is.


Sources

  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $4150$
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