0.6867778344606349544...

This number is neither prime nor composite.

                                          0 .686777834 4606349544 2654022370
6769269227 0026376225 0420739342 5294011531 0087700437 3669695301 0676825901

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+ The zero of the power series P(x) whose coefficient of x^n is equal to the nth prime, i.e., P(x) = 1 - 2x + 3x2 - 5x3 + 7x4 - 11x5 + 13x6 - .... [Post]

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