1847
This number is a prime.
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Smallest prime from initial digits of decimal expansion of
the connective constant of the hexagonal lattice, which B.
Nienhuis conjectured in 1982, and Hugo Duminil-Copin and
Stanislav Smirnov proved in 2010 is sqrt(2+sqrt(2)) ~
1.8477590650225735. [Post]
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