从列计数中获取列名

I have a count that goes from 4 to 31. This count is of the columns in a table. I want to know the column name with respect to the count. My column count will be changing as i have applied a loop. For Example : My column are F3,F4,.....F31. My count starts from 4, at this time my column is F3. How can i get the name of the column name. Next time when count becomes 4 the pointer will move ahead to column F4. At this moment i want the column name as F4. How can I achieve this.? Following is a code that counts no of columns for me.I have a count that goes from 4 to 31. This cou