Character “1” with long serif

Question

I'm looking for a character "1" with looong horizontal serif at the bottom (in math mode). Currently I use \mathtt{1}, but would prefer longer. I also tried stretching it horizontally by \scalebox, but then it produced some Fatal error, something like "too complex task", probably because of the subscripts.

Does anyone know a font or easy way to create "1" with long serif?

Answer 1

Depending on your needs you can probably fake it by overlaying a suitable rule:

\documentclass{article}


\protected\def\one{\mathpalette\xone{}}
\def\xone#1#2{\ooalign{%
\hss$#1\mkern3mu1\mkern3mu$\hss\cr
$#1\mkern1mu\hrulefill\mkern1mu$}}

\begin{document}

\[1+2+3+1\one1  X^{1+2+3+\one }\]


\end{document}