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n consecutives integers in a row , sum of any 3 successive is divided by ..

Source: Tournament Of Towns Spring 1999 Junior A Level p1

July 19, 2024
combinatoricsnumber theory

Problem Statement

nn consecutive positive integers are put down in a row (not necessarily in order) so that the sum of any three successive integers in the row is divisible by the leftmost number in the triple. What is the largest possible value of nn if the last number in the row is odd?
(A Shapovalov)