Nested tables and numerical keys in Lua

Question

I'm not sure if this is possible due to the numerical indices, but hopefully someone can point me in the right direction.

Given the table of:

t = { 13, 200, 12, 15, 23 }

how can I nest a table using the numbers?

t["200"] = {"stuff", "more stuff", "even more stuff"}

doesn't seem to work, as it'll create a position 200 and fill in the empty cells with null. I'd add a letter as a suffix/prefix, but the problem comes trying to sort the table numerically. Is this even possible, or am I stuck with a different method? Thanks!

Slight edit due to a realisation:

t["200"] = {"stuff", "more stuff", "even more stuff"}

actually creates a key of "200", whereas:

t[200] = {"stuff", "more stuff", "even more stuff"}

creates the index 200 with everything else null.