Number Sequencing Help

I'm sure this is a straightforward one - I'm trying to construct a list of numbers, basically:

1-10, 42-52, 84-94, etc, in one continuous list... This are the indexes of items I want to modify.

So there are 11 numbers (0 to 10), and a 'step' of 42 (0 to 42 to 84), and I need to be able to 'cap' the number of times the 11 numbers are added, for example 3 for the list above.

I'm sure this is simple, and I'm kicking myself that I can't figure it out for myself, so any help would be greatly appreciated!