4 9 28 99 ? 2105 12660
4 × 1 + 5 = 9 9 × 2 + 10 = 28 28 × 3 + 15 = 99 99 × 4 + 20 = 416 416 × 5 + 25 = 2105 2105 × 6 + 30 = 12660
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