Generate incremental number series from given set of numbers

Hi all, probably my problem is very trivial, but I can't seem to find a simple solution. I would like to generate an incremental series from a small sequence of numbers, for example 1 3 2 and from that generate the series 1 4 6 7 10 12 13..., so the intervals between the growing numbers would always be 1 3 2. Like a counter that doesn't have a fixed step size, but a list that is looped one position further every count. I will probably be able to built something that does the job, but I am wondering if there is an object that provides a solution for this task already? Thanks.