"no loops means less bugs" But the loops will be clear and explicit. People can check if you have an off-by-one error. Python does not support many recursive

"no loops means less bugs" But the loops will be clear and explicit. People can check if you have an off-by-one error. Python does not support many recursive calls, after "n" gets beyond a certain number, the code will crash with a RecursionError. That is a bug which is much harder to see. The code will crash if N < 0 for the n_th() method, which is probably a bug.