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QUESTION
For n 1 let Gn be the simple graph with vertex set V (Gn) = {1, 2, . , n}in which two different vertices i and j are adjacent whenever j is a...
For n ≥ 1 let Gn be the simple graph with vertex set V (Gn) = {1, 2, . . . , n}in which two different vertices i and j are adjacent whenever j is a multiple of i or i isa multiple of j. For what n is Gn planar?
