题解 | #尼科彻斯定理#

//由等差数列公式可得第一个数a1=n(n-1)+1
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		while(sc.hasNext()){
			int n = sc.nextInt();
			
			int a1 = n*(n-1)+1;
			System.out.print(a1);
			
			for(int i=1; i<n; i++){
				int ai = a1+2*i;
				System.out.print("+" + ai);
			}
			System.out.println();
		}
		
		sc.close();
	}
}