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Education > Math Recreational > Sum of first, s...
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Sum of first, second, and third powers are all squares

by Brian S <brianscsmith@[EMAIL PROTECTED] > Mar 9, 2008 at 07:45 PM

I recently came across this interesting pair of numbers: 345 and 184.
The sum of their first, second, and third powers are all perfect
squares:
345 + 184 = 23^2
345^2 + 184^2 = 391^2
345^3 + 184^3 = 6877^2

Are there any other nontrivial pairs like this, other than multiples
of these pairs?  I did a brute force search up to 46000 and found only
this pair and its multiples.
 




 5 Posts in Topic:
Sum of first, second, and third powers are all squares
Brian S <brianscsmith@  2008-03-09 19:45:43 
Re: Sum of first, second, and third powers are all squares
gaew <bennett@[EMAIL P  2008-03-09 20:55:37 
Re: Sum of first, second, and third powers are all squares
Tim Little <tim@[EMAIL  2008-03-10 05:35:32 
Re: Sum of first, second, and third powers are all squares
Tim Little <tim@[EMAIL  2008-03-10 05:20:38 
Re: Sum of first, second, and third powers are all squares
se16@[EMAIL PROTECTED]   2008-03-10 04:12:04 

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