perplexus.info :: General : Prime clock

Home > General

Prime clock (Posted on 2004-08-01)

Given a clock, rearrange six consecutive numbers on its face, so the sum of every pair of adjacent numbers is a prime.

See The Solution Submitted by Federico Kereki

Rating: 3.7500 (8 votes)

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

Solution

| Comment 14 of 16 |

13 is a prime number so swap 1 with 6, 2 with 5 and 3 with 4 giving you 13 in every direction, and only moving 6 numbers the first 6! :)

Posted by matt on 2004-08-02 13:51:49

Please log in:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (17)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info