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

15 Solutions

8 Solvers

Last Solution submitted on Apr 24, 2026

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers8

William minnolina CXD Lorenzo

Suggested Problems

More from this Author324

Community Treasure Hunt

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

Start Hunting!