2x2, 4, 5, 3x2, 5, 6, 3x3, 6, 9, 3x4, 7, 12, 3x5, 8, 15, 3x6, 18, 9, 3x7, 21, 10, 3x8, 24, 11, 3x9, 27, 12, 3x10, 30, 13, 3x11, 33, 14, 3x12, 36, 15.

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