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MathNet 2022-part-04 — 197 problems (EN–VI) Question 46

Math Olympiad Vault · MathNet 2022-part-04 — 197 problems (EN–VI)

Question 46

The set $S = \{1, 2, \ldots, 2022\}$ is to be partitioned into $n$ disjoint subsets $S_1, S_2, \ldots, S_n$ such that for each $i \in \{1, 2, \ldots, n\}$, exactly one of the following statements is true:

(a) For all $x, y \in S_i$ with $x \neq y$, $\operatorname{gcd}(x, y) \gt 1$.

(b) For all $x, y \in S_i$ with $x \neq y$, $\operatorname{gcd}(x, y) = 1$.

Find the smallest value of $n$ for which this is possible.