local numbers = {2, 3, 5, 7, 11, 13, 17}
-- ipairs walks the items in order, the
-- index is not needed: _
local text = ""
for _, number in ipairs(numbers) do
text = text .. number .. "; "
end
-- text = 2; 3; 5; 7; 11; 13; 17;
print("text = " .. text)