for1.lua

-- for i=1,5 do
--   print(i)
-- end
--
-- for i=1,10, 2 do
--   print(i)
-- end

-- for i=10,1,-1 do
--   print(i)
-- end

for i=1,math.huge do
  if (0.3*i^3 - 20*i^2 - 500 >=0) then
    print(i)
    break
  end
end