The number 1/2 can be written as 1/3+1/6 and 1/4+1/4, and the number 1/9 can be written as 1/18+1/18, 1/12+1/36, and 1/10+1/90. That is, 1/2 can be written as the sum of two unit fractions (those with a numerator of 1) in two ways, and 1/9 can be written as the sum of two unit fractions in three ways.
Write a function to count the ways 1/n can be written as the sum of two unit fractions.
Solve

Solution Stats

16 Solutions

9 Solvers

Last Solution submitted on Jun 05, 2026

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers9

Chris Cleveland minnolina CXD Lorenzo

Suggested Problems

More from this Author328

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!