Sum of Unit Fractions

Consider all fractions of the form where n is a positive integer.

Which of these fractions may be expressed as the sum of two different unit fractions (reciprocals of positive integers)?

Does your solution show you have found all of them?

This is problem 4545 from School Science and Mathematics. Proposed by Herb Wills, Tallahassee , FL.

Return to EMAT 4600/6600 Page.