Problem 59841. Count the ways to write 1/n as the sum of two unit fractions

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

78.57% Correct | 21.43% Incorrect
Last Solution submitted on Jul 19, 2025

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers7

Suggested Problems

More from this Author316

Community Treasure Hunt

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

Start Hunting!