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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)

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Solution

| Comment 14 of 17 |

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

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