perplexus.info :: Numbers : Prime Product Permutation

Prime Product Permutation (Posted on 2005-03-21)

Find three different digits that no matter in what order they are arranged, the three digit number formed is the product of two primes.

See The Solution Submitted by Old Original Oskar!

Rating: 3.2500 (4 votes)

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

Puzzle Answer

Comment 6 of 6 |

The three digits are 1,7, and 8.

All the three digit permutations of the digits is expressible as the product of two prime numbers, since:

178 = 2*89

187 = 11*17

718 = 2*359

781 = 11*71

817 = 19*43

871 = 13*67

Edited on January 29, 2024, 6:26 am

Posted by K Sengupta on 2023-12-24 21:52:16

Please log in:

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:


perplexus dot info