Dots

[Yago]

Hi to all.

I need a code to represent the number two square root in a continued fraction 
like the attached jpg file, and I have problems fot that. My last aproximation 
to the final moved dots is the code bellow, that's print the last 2 with the 
raised dots at right, but I'm not capable to insert this code in LyX math mode.

Thanks for your help.

\begin{document}
2$\:$\raisebox{-1.65ex}{$\ddots$}

\end{document}

<<attachment: sqrt2.jpg>>