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infinite sum a_j/2^j if a_n Fibonacci (Chile NMO 1991 P4)

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November 20, 2021
Fibonaccinumber theoryalgebraSum

Problem Statement

The sequence (ak)(a_k), k>0k> 0 is Fibonacci, with a0=a1=1a_0 = a_1 = 1. Calculate the value of j=0aj2j\sum_{j = 0}^{\infty} \frac{a_j}{2^j}