Iterated Roots Convergence

Calculus Level 2

1,1+2,1+2+3, \sqrt{1},\quad \sqrt{ 1 + \sqrt{2} },\quad \sqrt{ 1 + \sqrt{2 + \sqrt{3 } } },\quad \cdots

Consider the above sequence given by an=1+2+3++n a_n = \sqrt{ 1 + \sqrt{2 + \sqrt{3 + \cdots + \sqrt{n} } } } .

Does an a_n converge?

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