to superscript

-- superscript generator (for numbers)

function to_super(x)
    local function number_to_super(x)
        local y = tonumber(x)
        if y ~= nil then
            local tab = {"¹","²","³","⁴","⁵","⁶","⁷","⁸","⁹"}
            if tab[y] ~= nil then
                return tab[y]
            else
                return "⁰"
            end
        end
    end
    local y = tostring(x)
    local str = ""
    for i=1,#y do
        str = str..number_to_super(string.sub(y,i,i))
    end
    return str
end

print(to_super(81072))