olymmath

OBM 2022 Problem 3

    Let {an}n=0∞\{a_n\}_{n=0}^{\infty} be a sequence of integers numbers. Let Δ1an=an+1−an\Delta^1a_n=a_{n+1}-a_n for a non-negative integer nn . Define ΔMan=ΔM−1an+1−ΔM−1an\Delta^Ma_n= \Delta^{M-1}a_{n+1}- \Delta^{M-1}a_n . A sequence is patriota if there are positive integers k,lk,l such that an+k=ΔMan+la_{n+k}=\Delta^Ma_{n+l} for all non-negative integers nn . Determine, with proof, whether exists a sequence that the last value of MM for which the sequence is patriota is 20222022 .

    Dataset text AI-MO AoPS. Quoted with source.

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