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public class Test {
 /**
  * @param args
  */
 public static void main(String[] args) {
  /**
   * ÇóÖÊÊýºÍ£¬
   * Èç:
   * sum(1)=2=2
   * sum(2)=2+3=5
   * sum(3)=2+3+5=10
   * sum(4)=2+3+5+7=17
   * ...
   * sum(7)=2+3+5+7+11+13+17=58
   */
  System.out.println(Test.sum(7));
 }
//²úÉúÖÊÊýnµÄºóÒ»¸öÖÊÊý£¬Èçn=2,return 3
 public static int nextNum(int n){
  n++;
  for(int i=2;i<n;i++){
   if(n%i==0){
    //²»ÊÇÖÊÊý
    n++;
    continue;
   }
  }
  return n;
 }
//ÇóºÍ·½·¨
 public static int sum(int count){
  if(count <0) return 0;
  int sum = 2;
  int zn=2;
  for(int i=0;i<count-1;i++){
   zn=Test.nextNum(zn);
   System.out.println(zn);
   sum += zn;
  }
  
  return sum;
 }
}


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{
   
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