perplexus.info :: Numbers : Favorable Numbers

Favorable Numbers (Posted on 2006-11-02)

Call a positive integer n "favorable" if there is a set of n distinct positive integers whose reciprocals' sum adds to 1.

How many unfavorable numbers are there?

See The Solution Submitted by Gamer

Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

Minimalist Answer / No Spoiler

| Comment 1 of 5

Just one, no more.

Posted by Old Original Oskar! on 2006-11-02 10:56:09

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info