题目信息
Fermat primes are prime numbers that can be written in the form $${2}^{k}+{1}$$, where k is an integer and a power of 2. Which of the following is NOT a Fermat prime
A:3
B:5
C:17
D:31
E:257
参考答案及共享解析

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已选答案:
正确答案:
D:31
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