40,585/Historical Note
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Theorem
The fact that $40 \, 585$ is a factorion base $10$ was discovered as late as $1964$ by Leigh Janes.
Sources
- 1966: Joseph S. Madachy: Mathematics on Vacation
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $40,585$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $40,585$