$max_val = 0;d
$max_m = 0;
$max_n = 0;
 
for ($m = 1; $m < 1982; $m++) {
   for ($n = 1; $n < 1982; $n++) {
      $val = $n*$n - $m*$n - $n*$n;
      $val = $val*$val;
 
      if($val == 1)
      {
         $val = $m*$m + $n*$n;
 
         if($val > $max_val)
         {
            $max_val = $val;
            $max_m = $m;
            $max_n = $n;
         }
      }
   }
}
 
print "Max Value: ".$max_val." m: ". $max_m." n: ".$max_n;