How to make combinations in expression.

I'm sure this has to be a relatively simple problem, but I can't seem to figure out the answer. I want all the combinations you can have selecting 2 items from the same array, repeats allowed.

Say my array is {1,2,3,4,5}

I want to output {11, 12, 13, 14, 15, 21, 22, 23, 24, 25, 31, 32, 33, 34, 35, 41, 42, 43, 44, 45, 51, 52, 53, 54, 55}

And if possible, I want to expand this to have a means of creating 3 and 4 and 5 digit combinations.

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