How can I consecutively number only some pages of a document?

Question

The following code typesets a 12 page document; text only appears on every other page and there's an empty page between two text pages:

\documentclass{article}
\usepackage{atbegshi}
\usepackage{lipsum}

\makeatletter
\AtBeginShipout{%
  \ifodd\c@page
    \begingroup
      \AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox
      \global\AtBegShi@Discardedtrue
      \mbox{}\thispagestyle{empty}\clearpage
    \endgroup
  \else
  \fi%
}
\makeatother

\begin{document}

\lipsum[1-30]

\end{document}

Now I am trying to number sequentially the pages with text in them; with the code above pages with text are numbered 1,3,5,... but I would like them to be 1,2,3,... I did some attempts but none of them produced the desired result. How can I achieve the consecutive numbering?

The idea is to wrap this into a command that will allow to change the behaviour of the text flow inside a group: when invoked, the command will cause the text to be typeset in every other page but maintaining the consecutive numbering for the pages with text; once the group ends the text and numbering must return to their normal behaviour.

Answer 1

This seems to work for me. The trick is to use a different counter for the number of shipouts instead of the pages.

\documentclass{article}
\usepackage{changepage}
\usepackage{etoolbox}
\usepackage{atbegshi}
\usepackage{lipsum}

\newcounter{mypage}

\makeatletter
\AtBeginShipoutInit{\setcounter{mypage}{0}}
\AtBeginShipout{
  \ifnumodd{\value{mypage}}{
    \AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox
    \addtocounter{page}{-1}
  }{
    \mbox{}\thispagestyle{empty}\clearpage
  }
  \addtocounter{mypage}{1}
}

\makeatother

\begin{document}

First page \pageref{test}
Last page \pageref{test2}

\label{test}
\lipsum[1-30]
\label{test2}

\end{document}