Product of sigma(k)/phi(k)

Ralf Stephan ralf at
Fri Jul 8 19:41:44 CEST 2005

> (Does sum {1/x^(2^i)} have a known formula?)

It has continued fraction coefficients satisfying a
bifurcating (d&c) recurrence, for integer x. I conjecture it
is possible to write the cont.frac. in the unknown using
such a recurrence, if Shallit and/or van der Poorten have 
not already done so.


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