leetcode: (263) Ugly Number

【Question】

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 

2, 3, 5

.
For example, 

6, 8

 are ugly while 

14

 is
not ugly since it includes another prime factor

7

.

Note that 

1

 is typically treated as an ugly number.

解题思路，先对2整除将里面2的因子先去掉，然后再对3整除去除里面3的因子，再对5整除，最后不等于1就返回false

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.