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nested \sqrt{1+2\sqrt{1+3\sqrt{1+4\sqrt{1+...}}}} (Chile NMO 1998 P3)

Source:

November 24, 2021
Nested Radicalsnested radicalalgebraRadicals

Problem Statement

Evaluate 1+21+31+41+...\sqrt{1+2\sqrt{1+3\sqrt{1+4\sqrt{1+...}}}}.