An Egyptian fraction is the sum of distinct unit fractions. Are there any 2000 egyptian fractions that their sum is 1?
2026-02-23 03:35:22.1771817722
A question on egyptian fractions
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Yes! Because for any $k\geqslant 3$ we can write $1$ as sum of $k$ different fractions $\dfrac{1}{n}$. $\dfrac{1}{n}=\dfrac{1}{n+1}+\dfrac{1}{n(n+1)}$.
Apllying this identity we get: $1=\dfrac{1}{2}+\dfrac{1}{2}=\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}=\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{7}+\dfrac{1}{42}=\dots$