コラッツ数例

collatz.py

def collatz(number: int) -> int:
    if number % 2 == 0:
        return number // 2
    else:
        return 3 * number + 1

try:
    number = int(input('整数を入力してください:'))
    print(number)
    while number > 1:
        number = collatz(number)
        print(number)
except ValueError:
    print('不正な値です')