Henry Ernest Dudeney/Puzzles and Curious Problems/88 - Digital Progression/Historical Note
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Historical Note on Puzzles and Curious Problems by Henry Ernest Dudeney: $88$ - Digital Progression
Victor Meally informs Martin Gardner that subsequent to Dudeney's $4$ examples, Victor Michael Jean-Marie Thébault reported on $760$ such progressions in his Les Récréations Mathématiques from $1952$.
He also found that in addition to $456$ and its permutations, the middle number may be any of the permutations of $258$, $267$, $348$ and $357$.
Sources
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $125$. Digital Progression