2, 5, 9, 14, 20, 27……

import java.util.*;

class series
{
    public static void main(String args[])
    {
        int a=2,b=3;
        for(int i=1;i<=10;i++)
        {
           System.out.print(a+" ");
           a=a+b;
           b++;
          
           
        }
       
    }
}