mycroft holmes
Last Activity: 10 Years ago
Since x,y>2007 we have x = 2007+a, y = 2007+b for some naturals a,b
So, 1/(2007+a)+1/(2007+b) = 1/2007. Cross multiplying etc. we get,
ab = 2007^2 = 3^4 X 223^2
For any ordered pair of naturals a,b satisfying ab = 2007^2, we have the corresponding pair (x,y) = (2007+a, 2007+b) as a solution.
e.g. a=b=2007 gives x=y=4014
or a=1, b = 2007^2 gives x=2008,y=2007*2008
All in all we get 29 ordered pairs as solutions.