Solution-21

public class Solution21 {

public static void main(String[] args) {
int k=1;
for(int i=1;i<=5;i++)
{
for(int j=1;j<=i;j++,k++)
{
  System.out.print(k);
  if(i!=j)
  System.out.print("*");
}
System.out.println("");
}


}

}