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Someone told me that he heard that there is a proof based on the elliptic method that only one solution in intergers exists for this problem. This is beyond me however as I have no experience in this area. Can anyone lead me to a citation of the proof or tell me how to proceed. P.S. I determined that d has to equal the floor of the square root of n^3-n and that n=6, d=14 is a solution.

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