empty
public void suShu(){
int a = 0;
for (int i = 2; i < 100000; i++) {
boolean b = true;
for (int j =2; j < i ; j++) {
if(i%j==0){
b = false;
break;
}
}
if(b){
a++;
}
}
System.out.println(a);
}
素数就是质数，就是只能被1和自身整除的的数
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