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2005 a square? Baseless! (Posted on 2005-05-30) Difficulty: 3 of 5
2005 base 10 is not a square. Neither is 2005 base 7 a square (equal 2*7^3+5=691). Is there any base b such that 2005 base b is a square?

See The Solution Submitted by McWorter    
Rating: 3.6000 (5 votes)

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re(2): Solution | Comment 14 of 18 |
(In reply to re: Solution by pcbouhid)

Yes, I noticed this too late. Still, the proof holds if b'^3 is used instead of b'
  Posted by Robby Goetschalckx on 2005-06-01 07:52:01

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