For n ≥ 295660, the planar Turán number of C3∪C5 is floor((8n-13)/3), and the unique extremal planar graph is described.
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Planar Tur\'an number of disjoint union of $C_3$ and $C_5$
For n ≥ 295660, the planar Turán number of C3∪C5 is floor((8n-13)/3), and the unique extremal planar graph is described.