Lighthouse

term.clear()
term.setCursorPos(1,1)

print("Lighthouse Ramdor 2013")

local nL = 0
local nWire

while(true) do
  term.setCursorPos(1,4)

  nWire = (2 ^ nL)

  term.write(nWire.."    ")

  redstone.setBundledOutput("back", nWire)

  nL = nL + 1

  if(nL>7) then
    nL = 0
  end

  os.sleep(1)
end