1.1970449
This number is neither prime nor composite.
Analogous to Brun's constant for twin primes, this constant
is the sum of the reciprocals of all pairs of Cousin primes
(excluding the initial 1/3 + 1/7), i.e., (1/7 + 1/11) +
(1/13 + 1/17) + (1/19 + 1/23) + (1/37 + 1/41) + (1/43 +
1/47) + (1/67 + 1/71) + ... Theoretical Physicist Marek
Wolf made this approximation through 2^42, as described in
the paper "Generalized Brun's constants." [Post]
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