文字列の圧縮で学んだやり方を使うと def getGreatestDivisor(i): return getGreatestDivisorHelper(i - 1 , i , '') def getGreatestDivisorHelper(right, left , output): if right < 1: return output if left % right == 0: output += str(right) + ',' return getGreatestDivisorHelper(right - 1, left, output) return getGreatestDiv…