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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: 3.0000 (7 votes)

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Solution Simple solution, with no words! | Comment 8 of 13 |
1001001001...001001001 x 1001 =

1001001001...001001001000
++ 1001001...001001001001 =
-------------------------
1002002002...002002002001
Edited on October 11, 2003, 10:46 am
  Posted by Federico Kereki on 2003-10-11 10:44:15
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