Fibonacci and 2018

Let ( F n ) n 1 (F_{n})_{n \ge 1} be Fibonacci's sequence defined by the following recurrence relation: F 1 = 1 , F 2 = 1 F_1 = 1, \space F_2 = 1 and F n = F n 1 + F n 2 F_n = F_{n - 1} + F_{n - 2} for all natural number n 3 n \ge 3 .

Then, n = 1 F n ( 201 8 2018 ) n \displaystyle \large \sum_{n = 1}^{\infty} \frac{F_n}{(2018^{2018})^n} can be written as A B \frac{A}{B} being A , B A, B coprime positive integers.

What is the smallest positive integer C C such that B C (mod 2018) B \equiv C \text{ (mod 2018) } ?


The answer is 2017.

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