# Remove page number from backside of custom title page

In the following document, I am using \titleGM for a custom title page, from the titlepages collection. This results in a page number (in Roman numerals) on the backside of the title page. However, if I replace the custom \titleGM with \maketitle, then there is no page number on the backside.

Note that page numbering correctly restarts from i for the Table of Contents even with the custom title page.

How do I remove the page numbering from the backside of the custom title page?

\documentclass{memoir}

\usepackage[T1]{fontenc}

\input{titleGM.tex}

\usepackage{blindtext}

% https://tex.stackexchange.com/a/37396/2113
% Just to have a long enough ToC to see its page numbers
\usepackage{forloop}
\newcounter{loopcntr}
\newcommand{\rpt}[2][1]{%
\forloop{loopcntr}{0}{\value{loopcntr}<#1}{#2}%
}

\title{Retrocomputing with Clash}
\author{Gergő Érdi}
\date{}

\begin{document}
\frontmatter
\begin{titlingpage}
\titleGM
%% \maketitle
\end{titlingpage}

\tableofcontents

\mainmatter

\rpt[30]{\chapter{Foo}\Blindtext}

\backmatter
\end{document}


I suggest using this slightly modified version of titleGM

It will suppress a blank page before the title page and remove the page numbering up to the table of contents.

titleGM source from titlepages.pdf (page #53)

\documentclass[twoside]{memoir}

\usepackage[T1]{fontenc}

\usepackage{blindtext}

% https://tex.stackexchange.com/a/37396/2113
% Just to have a long enough ToC to see its page numbers
\usepackage{forloop}
\newcounter{loopcntr}
\newcommand{\rpt}[2][1]{%
\forloop{loopcntr}{0}{\value{loopcntr}<#1}{#2}%
}

\title{Retrocomputing with Clash}
\author{Gergő Érdi}
\date{}

\newcommand*{\titleGM}{%
\newlength{\drop}
\setlength{\drop}{0.1\textheight}
%   \vspace*{\baselineskip} % commented <<<<<<<<<<<<
\vfill
\hbox{%
\hspace*{0.2\textwidth}%
\rule{1pt}{\textheight}
\hspace*{0.05\textwidth}%
\parbox[b]{0.75\textwidth}
{\vbox{%
\vspace{\drop}
{\noindent\HUGE\bfseries Some\\ [0.5\baselineskip]
Conundrums}\\[2\baselineskip]
{\Large\itshape Puzzles for the Mind}\\[4\baselineskip]
{\Large THE AUTHOR}\par
\vspace{0.5\textheight}
{\noindent The Publisher}\\[\baselineskip]
}% end of vbox
}%   end of parbox
}%    end of hbox
\vfill
\null
\endgroup
}

\begin{document}

\begin{titlingpage}
\titleGM
%% \maketitle
\end{titlingpage}

\frontmatter
\tableofcontents

\mainmatter

\rpt[30]{\chapter{Foo}\Blindtext}

\backmatter