Smallest Multiple of 9 with all Digits Even/Historical Note

Theorem

David Wells, in his Curious and Interesting Numbers, 2nd ed. of $1997$, attributes this to an A.J. Turner, but it has not so far been possible to determine who this refers to.

This question seems to be a classic that regularly crops up in compendia of puzzles.

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $288$