The problem is that you are reversing the string a few times. The following will do: (defun base8 (n) (let ((t8 (truncate n 8)) (m8 (mod n 8))) (if (= t8 0) (list m8) (append (base8 t8) (list m8))))) EDIT Here's a solution without append, using a helper function.
On average, a kidney weighs approximately 150 to 160 grams and, together, both kidneys weigh about 0.5 percent of total body weight. Usually, the left kidney is slightly larger than the right. These measurements and weights represent the typical ranges of a healthy, adult human kidney.
What is a normal kidney size for a female - What is a normal kidney size for a female? 9-13 cm. With an ultrasound evaluation, the normal kidney size is 9-13 cm. One kidney may be up to 1.5 CM difference in size from the other and still be in acceptable range.