Latex code for "does not divide" symbols

ndiv.tex

\usepackage{graphicx}
\newcommand{\shortslash}{\raisebox{0.2ex}{\scalebox{0.65}{/}}}
\newcommand{\notdivides}{\!\mathrel{\backslash\kern-0.4em\shortslash}\!}

\newcommand{\notdividesTim}{\!\!\mathrel{\rotatebox[origin=c]{20}{$\nmid$}}\!\!}

\def\notdividesHeinrich{\mathpalette\notdiv\relax}
\let\divides=\backslash
\def\notdiv#1#2{\setbox0=\hbox{$#1\divides$}%
  \vcenter{\hbox to\wd0{\hss$\scriptscriptstyle/\hss$}}\kern-\wd0
  \vcenter{\hbox to\wd0{\hss$\scriptscriptstyle/\hss$}}\kern-\wd0
  \box0\relax}

\usepackage{wasysym}
\newcommand{\notdividesFiddley}{\notbackslash}