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\sqrt{n + 3}+ \sqrt{n +\sqrt{n + 3}} is integer (2016 Romanian NMO grade VII P1)

Source:

September 3, 2024
number theoryInteger

Problem Statement

Find all non-negative integers nn so that n+3+n+n+3\sqrt{n + 3}+ \sqrt{n +\sqrt{n + 3}} is an integer.