How to extend array?

I want to extend an array like this:

A = [1 2 3 4];

B = [2 3 5 7];

C =[1 1 2 2 2 3 3 3 3 3 4 4 4 4 4 4 4];

How could I do that?

Answer 1

[madhan ravi]

repelem(A,B)

[Rikke]

Perfect, thanks!