MathDB
Fibonacci mod 3

Source: LIMIT 2020 Cat 2 Obj P4

May 25, 2020
limitSequencenumber theory

Problem Statement

Define the sequence {an}n1\{a_n\}_{n\geq 1} as an=n1a_n=n-1, n2n\leq 2 and an=a_n= remainder left by an1+an2a_{n-1}+a_{n-2} when divided by 33 n2\forall n\geq 2. Then i=20182025ai=\sum_{i=2018}^{2025}a_i=?
(A)66 (B)77 (C)88 (D)99