Using step in a list that could be variable

I am trying to build some pager icons that obviously display one for each page. I am using a list and creating them dynamically based on results. In another part of the app I used a step="5" because I always had 5 items per page. On this part of the app, the first page has 6 items, and the second page (and any subsequent page) can have up to 12 items. Is there a way to change the step, or do some other work to ensure we are displaying the right amount of icons?