题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner fzhinput = new Scanner(System.in);
int num = fzhinput.nextInt();
int sum=0;
for(int i=0;i<num;i++){
sum+=2+3*i;
}
System.out.println(sum);
}
}
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