Supertabular + minipage

Question

I have a very long but narrow table (3 columns but 800 rows) and I would like to have it such that the table starts on the left side of the page and breaks onto the right side of the page before breaking again to continue on the left of a new page and so froth. I've tried supertabular but I'm not too sure how to proceed with minipage. (Perhaps it's not even the right option?) I would appreciate any help. Thanks!

Hope the diagram helps.

PAGE 1
row 1    row m+1
.        .
.        .
.        .
row m    row n

PAGE 2
row n+1  row k+1
.        .
.        .
.        .
row k    row l

Edit: I've implemented the code as such

\twocolumn
\bgroup
\centering
\tablefirsthead{\hline\multicolumn{1}{|c|} $d$ & $L_d(1)$ & $L_{2d}(1)$ \\ \hline}
\tablehead{\hline\multicolumn{1}{|c|} d & $L_d(1)$ & $L_{2d}(1)$ \\ \hline}
\tabletail{\hline}

%
\begin{supertabular}{|c| c |c|} \hline

1   &   0.655514389 &   0.927037339 \\  
3   &   1.513845635 &   0   \\  
5   &   0   &   1.658334806 \\  
7   &   0   &   0   \\  
11  &   0.790580099 &   0   \\  
etc.
\end{supertabular}
\par
\egroup
\onecolumn

But encountered a problem, I was unable to put the d in the first column of the table heads into math mode without breaking the code. See errors below:

l.629 \begin{supertabular}{|c| c |c|}
\hline
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.
! Missing $ inserted.
<inserted text>
$
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Missing } inserted.
<inserted text>
}
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Missing $ inserted.
<inserted text>
$
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Extra }, or forgotten $.
\@preamble ...ignorespaces \@sharp \unskip \hfil }
\hskip \tabcolsep \hskip -...
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.
! Missing $ inserted.
<inserted text>
$
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Missing } inserted.
<inserted text>
}
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Missing $ inserted.
<inserted text>
$
l.629 \begin{supertabular}{|c| c |c|}
\hline
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.

Answer 1

You can use \twocolumn with supertabular:

\documentclass[12pt]{article}
\usepackage{supertabular}
\usepackage[a4paper,top=3in, bottom = 3in, left = 1in, right = 1in,heightrounded]{geometry}  % only for this document, this border.
\usepackage{microtype,textcomp}  % just for fun
\usepackage{array}
\newcommand\myrows{%
 & 23 & 45 \\
 & 56 & 87 \\
 & 23 & 45 \\
 & 56 & 87 \\
 & 23 & 45 \\
 & 56 & 87 
}
\newcommand\Myrow{%
    \myrows\\
    \myrows\\
    \myrows\\
    \myrows\\
    \myrows\\
    \myrows\\
    \myrows
    }
\newcounter{rowno}
\setcounter{rowno}{0}
%==================================================================
\begin{document}
%===============================================================
%This is some dummy text just for demo used here. It is in one column mode.
\twocolumn
\bgroup
\centering
\tablefirsthead{\hline\multicolumn{1}{|c|}{\textnumero}& Name& number \\ \hline}
%
\tablehead{
%\multicolumn{3}{c}%
%{{\bfseries  Continued from previous page}} \\
\hline
\multicolumn{1}{|c|}{\textnumero}& Name & number\\ \hline}
%
\tabletail{
\hline \multicolumn{3}{|r|}{{Continued on next page}} \\ \hline}
%
\tablelasttail{
\\\hline
\multicolumn{3}{|r|}{{Concluded}} \\ \hline}
%
\begin{supertabular}{|>{\stepcounter{rowno}\therowno.}c|c|c|}\hline
    \Myrow\\
    \Myrow
\end{supertabular}%
\par
\egroup
\onecolumn
This is some dummy text just for demo used here. It is in one column mode.
\end{document}