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Find all positive integers k - ISL 1968

Source:

September 23, 2010
number theoryDivisibilityIMO Shortlist

Problem Statement

Let a0,a1,,ak (k1)a_0, a_1, \ldots , a_k \ (k \geq 1) be positive integers. Find all positive integers yy such that a0y,(a0+a1)(y+a1),,(a0+an)(y+an).a_0 | y, (a_0 + a_1) | (y + a1), \ldots , (a_0 + a_n) | (y + a_n).