0.5164541789407885653...

This number is neither prime nor composite.

                                   0.516454 1789407885 6533048734 2971522858
8159685534 1541970144 1931065273 5687014402 1272349915 4883293666 2153740324

+ The sum of reciprocals of Mersenne primes. [Gudipati]

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