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Short and sweet (Posted on 2011-02-21) Difficulty: 3 of 5
Let n be any natural number whose square is also the difference between two consecutive cubes.

Prove that 2n-1 is also a square.

  Submitted by broll    
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Solution: (Hide)
See xdog's solution in the comments for a nice method.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(2): spoilerbroll2011-02-25 09:01:26
Some Thoughtsre: spoilerAdy TZIDON2011-02-25 06:23:33
re: spoilerbroll2011-02-25 04:05:28
spoilerxdog2011-02-23 18:48:46
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