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00 Separate (Posted on 2003-10-10) Difficulty: 1 of 5
Prove that the numbers that begin with 1 and end with 1, with any number of 2s in the middle, and all 1s and 2s separated by 00 are composite.

For example:
1002001
1002002001,
1002002002001,
1002002002002001

See The Solution Submitted by Gamer    
Rating: 3.5714 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Divisibility | Comment 5 of 13 |
(In reply to Divisibility by Nick Hobson)

ooohhhh I'm in such a nitpicking mood today...

Similar to your "Formula None Racer" problem... I suggest that you demonstrate why the divisibility test, you refer to, works. Or at least provide a reference to it on the web (I saw plenty of those).
  Posted by SilverKnight on 2003-10-10 16:33:58

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