How about 1 / 3 + 1 / 15 + 1 / 35 + 1 / 63 + 1 / 99.1/323

Original formula = 1 / 3 + (1 / 3-1 / 5) / 2 + (1 / 5-1 / 7) / 2 + (1/17-1/19)/2
Then = 1 / 3 + (1 / 3-1 / 19) / 2 And then there's the answer

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