Let N be the positive integer 7777...777, a 313digit number where each digit is a 7. Let f(r) be the leading digit of the rth root of N. What is f(2) + f(3) + f(4) + f(5) + f(6)?
Source: AMC 10B Fall 2021
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Zach Marinovhttps://etonstem.com/author/zach

Zach Marinovhttps://etonstem.com/author/zach

Zach Marinovhttps://etonstem.com/author/zach

Zach Marinovhttps://etonstem.com/author/zach
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