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MathNet 2019-part-03 — 184 problems (EN–VI) Question 160

Math Olympiad Vault · MathNet 2019-part-03 — 184 problems (EN–VI)

Question 160

How many ordered pairs $(x, y)$ of positive integers less than or equal to $2019$ are there such that $x+y$ and $x y+1$ are powers of $2$?