Problem

Source: Kyiv City MO 2024 Round 1, Problem 8.5

Tags: number theory, Divisors



Find the smallest positive integer $n$ that has at least $7$ positive divisors $1 = d_1 < d_2 < \ldots < d_k = n$, $k \geq 7$, and for which the following equalities hold: $$d_7 = 2d_5 + 1\text{ and }d_7 = 3d_4 - 1$$ Proposed by Mykyta Kharin