题解 | #尼科彻斯定理#--循环+等差数列求和

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            int num = in.nextInt();
            int sum = num * num * num;
            int firstNum = 0;
            for (int i = 1; i <= sum - num; i++) {
                if (i % 2 == 1) {
                    int tem = i * num + num * (num - 1);
                    if (tem == sum) {
                        firstNum = i;
                    }
                }
            }
            for (int i = 0; i < num - 1; i++) {
                System.out.print((2 * i + firstNum) + "+");
            }
            System.out.print(firstNum + 2 * (num - 1));
        }
    }
}