Add more horizontal space in an array

Question

Is there a setting I can input to the array environment, which will slightly increase the horizontal spacing between each entry?

I would appreciate it if you could test your code on the following example I am using:

\documentclass{article}
\usepackage{forloop}
\newcounter{loopcntr} 
\newcommand{\rpt}[2][1]{% repeat text
   \forloop{loopcntr}{0}{\value{loopcntr}<#1}{#2} } 
\begin{document}
\[ \begin{array}{*{5}{c}}
1 & 2 & 3 & 4 & \ldots \\
\rpt[4]{\downarrow &} \unskip \downarrow \\
x_{1}^1 & x_{1}^2 & x_{2}^1 & x_{1}^3 & \ldots \\
\end{array} \]
\end{document}

I want slightly more whitespace between each number, between each arrow, and between each x.

Answer 1

add something like

\setlength\arraycolsep{20pt}

before the array.