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If it is the emblem of the Seventh International Conference on Mathematics Education, its theme is evolved from a series of right triangles as shown in the figure.
From the known OA 1= 1, OA2=2, OA3=3, OA4 = 4 = 2 ... it can be seen that OAn=n, so OA9 = 9 = 3；;
Through observation, we can find six items, namely: OA 1, OA4, OA9, OA 16, OA25 and OA36.