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A Constant Puzzle (Posted on 2006-12-02) Difficulty: 2 of 5
Determine a positive integer constant c such that the equation xy2 - y2+ x+ y = c has precisely three solutions in positive integers.

See The Solution Submitted by K Sengupta    
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re: solutions (spoiler) | Comment 3 of 4 |
(In reply to solutions (spoiler) by Daniel)

Comparing your list to mine, I see 90 and 92 are on my list but not yours (besides the numbers that exceed 100).

 x   y          c
 45  1         90
 6  4         90
 1  89        90
 46  1         92
 2  9         92
 1  91        92

  Posted by Charlie on 2006-12-02 14:31:00
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