Assigning a value for the for loop

Question

Can I assign a character to each unit printed in the "for" loop?

Answer 1

Now I want to say two numbers called a and b, and I want the number of terms.
When the program runs, it will print from 1 to the number of terms, but print the numbers that are exactly divisible to a or b.
I can not use an if for a certain number because the value that the user will input will change constantly.
So when I print the pattern, I want the 3rd term, but the 3rd term will change according to the values entered by the user.
How can I do that ?