How to generate the following series in C language?

Question

I want to generate the following series in C language, please help.

1
2 3
3 4 5
4 5 6 7
5 6 7 8 9
6 7 8 9 10 11

Answer 1

print_series()
{
  for (i=1; i<7;i++)
  {
    for (j=0; j<i;j++)
    {
      printf("%d ", i+j);
    }
    printf("\n");
  }
}