Pagenumber within \cref command

Question

I am writing a script for a lecture in math and have quite a few cross-references in it. Now i have the problem, that the cross-references are sometimes pretty far away from the theorems they refer to. I would like to have a way (by options of the cleveref package or a renewcommand for \cref) to put the page number into the output of \cref. I've alredy tried a \renewcommand like

\renewcommand{\cref}[1]{\namecref{#1} \labelcref{#1} (\cpageref{#1})}

but I have also some references to more than one label. The problem with this renewcommand is that \nameref{} takes only one label and so after the change I get some "??" in my document. I could possibly go through the whole document again and add the page ref everywhere it is needed, but this would take a lot of time and I would appreciate it, if there would be a more easy way. It would also be great if the page ref could only be given if the label is on a different page than the cross-reference call-out (if this is even possible). I've searched the Internet now for quite a while and didn't find an answer to this problem.

Thanks in advance for your efforts

PS: the document class is article:

\documentclass[12pt,a4paper]{article}
\usepackage[utf8x]{inputenc}
\usepackage{amsthm}
\usepackage{cleveref}

\newtheoremstyle{thm}   {\topsep}{\topsep}{\itshape}{-0.25em}{\bfseries}{}{0.5em}{}
\theoremstyle{thm}
    \newtheorem {theorem}   {Theorem}[section]

\Crefname{theorem}{theorem}{theorems}
\crefname{theorem}{theorem}{theorems}

\begin{document}
    \section{Something}
    \begin{theorem}
        \label{Theorem_1}
        Some theorem.
        \begin{equation}
            a^2+b^2=c^2\label{eq:1}
        \end{equation}
    \end{theorem}
    maybe some other text
    \begin{theorem}
        \label{Theorem}
        Soem other theorem.
    \end{theorem}
    A reference to \cref{Theorem} everything is great
    \newpage
    If I put a reference here to \cref{Theorem_1} I would prefer it would be like \cref{Theorem_1} (\cpageref{Theorem_1}).
\end{document}

Answer 1

The varioref package and its \vref macro pretty much do what you're looking to accomplish.

Note that if both varioref and cleveref are loaded, varioref must be loaded before cleveref. If both packages are loaded, the command \vref acts very much like \cref, except that it automatically inserts a page number reference (as well as the main cross-reference) whenever the call-out and the cross-referenced item aren't located on the same page.

\documentclass[12pt,a4paper]{article}
\usepackage[utf8x]{inputenc}
\usepackage{amsthm}
\usepackage{varioref}
\usepackage{cleveref}

\newtheoremstyle{thm}   {\topsep}{\topsep}{\itshape}{-0.25em}{\bfseries}{}{0.5em}{}
\theoremstyle{thm}
\newtheorem{theorem}{Theorem}[section]

%\Crefname{theorem}{theorem}{theorems}
%\crefname{theorem}{theorem}{theorems}

\begin{document}
\setcounter{section}{1}

\begin{theorem} \label{Theorem_1}
Some theorem.
\begin{equation} a^2+b^2=c^2\label{eq:1} \end{equation}
\end{theorem}
Maybe some other text
\begin{theorem}\label{Theorem_2}
Some other theorem.
\end{theorem}

A cross-reference to \cref{Theorem_2}---everything is great.

\newpage \null \newpage

I would like a cross-reference of the form ``\vref{Theorem_1}''.
\end{document}