Sum of 5 Unit Fractions that equals 1
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Theorem
There are $147$ ways to represent $1$ as the sum of exactly $5$ unit fractions.
Proof
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Historical Note
According to 1997: David Wells: Curious and Interesting Numbers (2nd ed.), this result is attributed to David Breyer Singmaster.
Sources
- 1994: Richard K. Guy: Unsolved Problems in Number Theory (2nd ed.)
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $14$