leetcode-problemset/leetcode-cn/problem (English)/检查元素频次是否为质数(English) [check-if-any-element-has-prime-frequency].html

<p>You are given an integer array <code>nums</code>.</p>

<p>Return <code>true</code> if the frequency of any element of the array is <strong>prime</strong>, otherwise, return <code>false</code>.</p>

<p>The <strong>frequency</strong> of an element <code>x</code> is the number of times it occurs in the array.</p>

<p>A prime number is a natural number greater than 1 with only two factors, 1 and itself.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [1,2,3,4,5,4]</span></p>

<p><strong>Output:</strong> <span class="example-io">true</span></p>

<p><strong>Explanation:</strong></p>

<p>4 has a frequency of two, which is a prime number.</p>
</div>

<p><strong class="example">Example 2:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [1,2,3,4,5]</span></p>

<p><strong>Output:</strong> <span class="example-io">false</span></p>

<p><strong>Explanation:</strong></p>

<p>All elements have a frequency of one.</p>
</div>

<p><strong class="example">Example 3:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [2,2,2,4,4]</span></p>

<p><strong>Output:</strong> <span class="example-io">true</span></p>

<p><strong>Explanation:</strong></p>

<p>Both 2 and 4 have a prime frequency.</p>
</div>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= nums.length &lt;= 100</code></li>
	<li><code>0 &lt;= nums[i] &lt;= 100</code></li>
</ul>