
This is a minimal solution, as the text in the image indicates. To have a general command, some more work is needed---"general" meaning for numbers <= 35.
Remark. The command \rnum is there in case some development follows. Otherwise, one can simply write I instead of rnum{1} and so on.
The code
\documentclass[11pt, a4paper]{article}
% \usepackage{ifthen}
\newcommand{\rnum}[1]{\MakeUppercase{\romannumeral #1}}
\newcommand{\rnumsf}[1]{\MakeUppercase{\textsf{\romannumeral #1}}}
\begin{document}
\noindent
You can obtain something like this for particular cases (working each
case separately):
\rnum{1}\hspace{-.7pt}\rnum{1},
\rnum{1}\hspace{-.7pt}\rnum{1}\hspace{-1pt}\rnum{1},
\rnum{1}\rnumsf{5}.
\end{document}