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### leetcode Ugly Number

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.

Ugly numbers 是一个只能被2，3，5整除的数，给你一个数，判断是否是 ugly number

C++

Java

Python

### 264. Ugly Number II

Write a program to find the n-th ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12 is the sequence of the first 10 ugly numbers.

Note that 1 is typically treated as an ugly number.

Ugly numbers 是一个只能被2，3，5整除的数，求第n个Ugly number

• *2：肯定是没放入队列中的
• *3：若一个数不是6的倍数，那么说明肯定没有加入队列中，可以加入
• *5：若不是10或者15的倍数，说明也没加入到队列中

C++

Java

Python