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g0201_0300.s0263_ugly_number.readme.md Maven / Gradle / Ivy

263\. Ugly Number

Easy

An **ugly number** is a positive integer whose prime factors are limited to `2`, `3`, and `5`.

Given an integer `n`, return `true` _if_ `n` _is an **ugly number**_.

**Example 1:**

**Input:** n = 6

**Output:** true

**Explanation:** 6 = 2 × 3

**Example 2:**

**Input:** n = 1

**Output:** true

**Explanation:** 1 has no prime factors, therefore all of its prime factors are limited to 2, 3, and 5.

**Example 3:**

**Input:** n = 14

**Output:** false

**Explanation:** 14 is not ugly since it includes the prime factor 7.

**Constraints:**

*   -231 <= n <= 231 - 1