AMC 10 Step by Step
2017 AMC 10AProblem 13P11-15~3 minPrint

Define a sequence recursively by F0=0, F1=1,F_{0}=0,~F_{1}=1, and Fn=F_{n}= the remainder when Fn1+Fn2F_{n-1}+F_{n-2} is divided by 3,3, for all n2.n\geq 2. Thus the sequence starts 0,1,1,2,0,2,0,1,1,2,0,2,\ldots What is F2017+F2018+F2019+F2020+F2021+F2022+F2023+F2024?F_{2017}+F_{2018}+F_{2019}+F_{2020}+F_{2021}+F_{2022}+F_{2023}+F_{2024}?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.