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- <?php
- function isprime ($num) {
- $i = (int)(sqrt($num));
- while ($i>1) {
- if ($num%$i==0) {
- return 0;
- }
- $i--;
- }
- return 1;
- }
- $limit=2000000;
- $sum=0;
- while($limit>1) {
- if (isprime($limit)) { $sum+=$limit; }
- $limit--;
- }
- echo $sum;
- ?>
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