Solution
The logic is,
1 = 1 $$\times$$ 2 - 1 = 1,
2 = 2 $$\times$$ 2 - 1 = 3,
3 = 3 $$\times$$ 2 - 1 = 5,
4 = 4 $$\times$$ 2 - 1 = 7,
5 = 5 $$\times$$ 2 - 1 = 9
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