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Jan 20, 2023 at 10:41 comment added Reid Barton Another reference is IMO 2018 problem 3, as mentioned in Trishan's answer, or imo-official.org/problems/IMO2018SL.pdf problem C4, page 27. This problem seems to be rediscovered frequently.
Jan 20, 2023 at 10:07 history edited Gerry Myerson CC BY-SA 4.0
additional reference
Jul 24, 2015 at 14:12 history edited Benjamin Dickman CC BY-SA 3.0
The final link was broken; replaced it with a working one.
Dec 2, 2010 at 0:48 vote accept Denis Serre
Dec 2, 2010 at 0:13 history edited Gerry Myerson CC BY-SA 2.5
added 484 characters in body
Dec 1, 2010 at 23:21 history answered Gerry Myerson CC BY-SA 2.5