#include <stdio.h>
//13番目で初めて10000を超えると表示された。
int main(){
int a=3,n=0;
do{
a=2*a-1;
n=n+1;
}
while(a<=10000);
printf("%d番目で初めて10000を超える。\n",n
);
return 0;
}
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