Product of sigma(k)/phi(k) - CF vs. Non-Squashing Partitions

Ralf Stephan ralf at
Sat Jul 9 09:12:04 CEST 2005

>     Is it merely coincidence that 
>  |A110036(n)| = 2*A090678(n+3)  ???

No, I already said the coefficients satisfy a bifurcating recurrence
but I should have said polyfurcating as it is 32-fold. Please see
the references in A007400 and A004200:

%H A007400 J. O. Shallit, <a href="">Simple continued fractions for some irrational numbers</a>. J. Number Theory 11 (1979), no. 2, 209-217.
%H A007400 H. Cohn, <a href="">Symmetry and specializability in continued fractions</a>
%H A007400 A. J. van der Poorten, <a href="">An introduction to continued fractions</a>


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