perplexus.info :: Numbers : The magic Number

Home > Numbers

The magic Number (Posted on 2004-03-17)

Whats the smallest number ("the magic number") that can satisfy these conditions?

- its positive

- it is not divisible by any number below 20 (excluding 1)

- the average of the digits is an even number between 3 and 9

See The Solution Submitted by Victor Zapana

Rating: 3.3333 (9 votes)

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

re: solution -- note

| Comment 9 of 35 |

(In reply to solution by Charlie)

The lowest non-prime meeting the criteria is 1357 = 23 * 59.

Posted by Charlie on 2004-03-17 09:02:15

Please log in:

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