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LCM and GCD Sequence (Posted on 2016-04-29) Difficulty: 3 of 5
Find all pairs (X,Y) of positive integers such that:
gcd(X,Y), lcm(X,Y)-1 and XY (in this order) are in arithmetic sequence.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
Some Thoughtsprobable solution (spoiler)Charlie2016-04-29 11:30:46
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