Iterate through numbers using seq() and rep()

Question

I need to use rep() and seq() to get the following vector:

1 2 3 4 5 2 3 4 5 6 3 4 5 6 7 4 5 6 7 8 5 6 7 8 9 

No

Answer 1

One liner,

do.call(c,sapply(1:5,seq,length.out=5,simplify=FALSE))

Or even simpler,

rep(seq(5),each=5)+seq(5)-1