题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include <stdio.h>
int main() {
int n;
while (scanf("%d", &n) != EOF) {
int sum = 2;
int temp = 2;
for(int i = 0; i < n - 1; i++){
temp += 3;
sum += temp;
}
printf("%d\n", sum);
}
return 0;
}
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