Definition:Perfect Digit-to-Digit Invariant/Also known as
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Perfect Digit-to-Digit Invariant: Also known as
A perfect digit-to-digit invariant is also known as a Münchhausen number.
This comes from the idea that these perfect digit-to-digit invariants "raise themselves" similarly to how Baron Hieronymus von Münchhausen raised himself by riding a cannonball in the $1943$ film Münchhausen.
Some sources render the name as Munchausen, with or without the umlaut.
Sources
- Weisstein, Eric W. "Münchhausen Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/MuenchhausenNumber.html