Formally, we define a sequence of functions $(f_n)$ such that $f_0(x) = x$ and $f_{a+1}(x) = \log(f_a(x))$.
What is $$\text{O}\left(\sum_{i=0}^n f_i(n)\right)?$$
2026-04-19 12:29:34.1776601774
Complexity of $x+\log x+\log(\log x)+...+\log(\log(\log(...(\log x)...)))$
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