All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
Prime pentagon (Posted on 2012-11-27) Difficulty: 4 of 5
Joining every vertex of a convex pentagon to every other vertex forms three nested figures:

the original outer pentagon
an inner pentagon
a five-pointed star between them

Suppose the perimeters of these three figures are all primes; show that the three primes’ sum is at least 20.

No Solution Yet Submitted by Danish Ahmed Khan    
No Rating

Comments: ( You must be logged in to post comments.)
  Subject Author Date
First thoughts ...brianjn2012-12-07 03:10:32
Something I'm missing?atheron2012-12-06 22:07:18
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 (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information