\newcounter{i} \setcounter{i}{1}
\newcounter{j} \setcounter{j}{0}
\newcounter{r} \setcounter{r}{0}
\usepackage{pstricks}
\usepackage{ifthen}
\usepackage{calc}
\psset{unit=.66mm}
\begin{document}
\begin{pspicture}*(100, 100)
\pspolygon(0, 0)(100, 0)(100, 100)(0, 100)
\psset{linewidth=.1pt}
\whiledo{\value{i}<25}{%
\setcounter{j}{\value{i}*4}
\setcounter{r}{\value{i}*3}
\pscircle(\value{j},\value{j}){\value{r}}
\stepcounter{i}
}
\end{pspicture}
\end{document}