#include <stdio.h>
int main(void) {
// your code goes here
int a_0=3;
int a_n=0;
int n=0;
do
{
a_n=2*a_0-1;
a_0=a_n;
n=n+1;
}while(a_n<=10000);
printf("10000を超えたときの値は%d\n",a_n
); return 0;
}
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