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Jan 16, 2018 at 20:13 history edited Arnaud Mortier CC BY-SA 3.0
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Jan 16, 2018 at 20:02 comment added Arnaud Mortier You're right! I went too fast on that first line!
Jan 16, 2018 at 18:57 comment added Gerhard Paseman If n=5, x=8/3 satisfies condition (1). I recommend (since x is rational) using x=3y to see that it suffices to have the numerator of y also divide n(n+3). Gerhard "Rational Numbers Scale Quite Nicely" Paseman, 2018.01.16.
Jan 16, 2018 at 17:33 history answered Arnaud Mortier CC BY-SA 3.0