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Smallest prime from the the first n digits of the decimal
expansion of sum of the reciprocals of the Mersenne primes:
(1/3) + (1/7) + (1/31) + (1/127) + (1/8191) + (1/131071) +
(1/524287) + ... + 1/(primes of form 2^p  1, where p is a
prime) ~ 0.51645417894. [Post]
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