Henry Ernest Dudeney/Modern Puzzles/70 - The Solitary Seven/Historical Note

Historical Note on Modern Puzzles by Henry Ernest Dudeney: $70$ - The Solitary Seven

This puzzle was originally submitted to Henry Ernest Dudeney by a person identified merely as the Rev. E. F. O.

Dudeney then published it in The Strand Magazine.

Research is needed to determine which issue.

The uniqueness of the solution was proved at the time by Harold Revell.

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Arithmetical and Algebraical Problems: Digital Puzzles: $70$. -- The Solitary Seven
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Skeleton Puzzles: $144$. The Solitary Seven
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $144$. The Solitary Seven