在javaeye看到的这个题目：http://www.iteye.com/topic/996233
我用PHP实现了一下
<?php
$pur = array();
for ($i=2; $i<101; $i++){
$flag = false;
for ($j=2; $i<=4 ? $j<$i : $j<=$i/2; $j++){
if ($i % $j == 0){
$flag = false;
break 1;
}else{
$flag = true;
}
}
if($flag){
array_push($pur, $i);
}
}
echo "<pre>",print_r($pur),"</pre>";
?>
输出：
Array ( [0] => 3 [1] => 5 [2] => 7 [3] => 11 [4] => 13 [5] => 17 [6] => 19 [7] => 23 [8] => 29 [9] => 31 [10] => 37 [11] => 41 [12] => 43 [13] => 47 [14] => 53 [15] => 59 [16] => 61 [17] => 67 [18] => 71 [19] => 73 [20] => 79 [21] => 83 [22] => 89 [23] => 97 )
