gistfile1.txt

<?php
function primefactor($num) {
    $sqrt = sqrt($num);
    for ($i = 2; $i <= $sqrt; $i++) {
        if ($num % $i == 0) {
            return array_merge(primefactor($num/$i), array($i));
        }
    }
    return array($num);
}


$y=1;
while($y<=500){
    $res= primefactor($y);
    $default_array= array(2,3,5,7);
   $arr_unique= array_unique($res);
   $result = array_intersect($default_array, $arr_unique);
$diff= array_diff($arr_unique,$result);
    if(empty($diff)){
echo  $y;
        echo '<br>';
      }


    $y++;
}

?>