Ralf Stephan wrote: > %H A007400 A. J. van der Poorten, <a href="http://www-centre.mpce.mq.edu.au/alfpapers/a075.pdf">An introduction to continued fractions</a> This link is broken. The paper is available at http://www.lacim.uqam.ca/~plouffe/OEIS/archive_in_pdf/a075.pdf Max