Stairmine

tArgs = {...}
Numbers = {}
if #tArgs ~= 2 then
    print("Usage: stairmine  <length> <blocks per torch>")
    error()
end
for i=1,#tArgs[2] do
    Numbers[i] = tArgs[2] * i
end
for i=1,tArgs[1] do
    turtle.digDown()
    turtle.dig()
    turtle.forward()
    turtle.digDown()
    turtle.down()
        for x=1,#Numbers do
        if i == Numbers[x] then
            turtle.select(16)
            turtle.placeUp()
        end
    end
end