{ "data": { "question": { "questionId": "897", "questionFrontendId": "866", "categoryTitle": "Algorithms", "boundTopicId": 1659, "title": "Prime Palindrome", "titleSlug": "prime-palindrome", "content": "
Given an integer n, return the smallest prime palindrome greater than or equal to n
.
An integer is prime if it has exactly two divisors: 1
and itself. Note that 1
is not a prime number.
2
, 3
, 5
, 7
, 11
, and 13
are all primes.An integer is a palindrome if it reads the same from left to right as it does from right to left.
\n\n101
and 12321
are palindromes.The test cases are generated so that the answer always exists and is in the range [2, 2 * 108]
.
\n
Example 1:
\nInput: n = 6\nOutput: 7\n
Example 2:
\nInput: n = 8\nOutput: 11\n
Example 3:
\nInput: n = 13\nOutput: 101\n\n
\n
Constraints:
\n\n1 <= n <= 108
求出大于或等于 N
的最小回文素数。
回顾一下,如果一个数大于 1,且其因数只有 1 和它自身,那么这个数是素数。
\n\n例如,2,3,5,7,11 以及 13 是素数。
\n\n回顾一下,如果一个数从左往右读与从右往左读是一样的,那么这个数是回文数。
\n\n例如,12321 是回文数。
\n\n\n\n
示例 1:
\n\n输入:6\n输出:7\n\n\n
示例 2:
\n\n输入:8\n输出:11\n\n\n
示例 3:
\n\n输入:13\n输出:101\n\n
\n\n
提示:
\n\n1 <= N <= 10^8
2 * 10^8
。\n\n
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