Generate a repeating sequence

Question

I need to generate a vector of the following format using R:

1:10, 1:10, 11:20, 11:20, ... 121:130, 121:130

Is there an easier way than cre

Answer 1

Is this what you want?

unlist(lapply(rep(seq(1, 121, by=10), each=2), function(x) seq(x, x+9)))