PHP - Moved: Geometric Progression?

can this be improved?
I can increment every 20, and there will never be more than 10,000 record count

Code: [Select]
  $count = 1;
  while ($count <= 10000)
     {   
     if (($rpos>=$count) and ($rpos<($count+20))){$dum = $count;break;}
     $count =($count +20);
     }

  echo 'weirdcounter'.$dum.'<BR>';

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