#include <stdio.h>
// 練習問題F
int func(int n){
int a=-1,i;
for (i=1;i<=n;i++){
a=3*a+5;}
return a;}
int main(void){
int n=3;
printf("数列anについてn=%dのときの値は%d\n",n
,func
(n
)); return 0;}
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