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Khinchin proved that
For almost all reals $r$ with continued fraction representation
$[a_o; a_1, a_2, \dots ]$ the sequence
$K_n = \left(\prod_{i=1}^{n} a_i\right)^{1/n}$ converges to a constant $K$ (Khinchin's constant)
independent of $r$.
This is quite surprising, and I was wonde...
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