题解 | #尼科彻斯定理#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext())
        {
            int n = sc.nextInt();
            String[] strs = new String[n];
            int k = n*n-n+1;
            int j = 0;
            for (int i = 0; i < n; i++)
            {
                strs[i] = String.valueOf(k+j);
                j+=2;
            }
            System.out.println(String.join("+",strs));
        }
    }
}