AMC8 2003
AMC8 2003 · Q2
AMC8 2003 · Q2. It mainly tests Primes & prime factorization, Parity (odd/even).
Which of the following numbers has the smallest prime factor?
下列哪个数的质因数最小？
(A)
55
55
(B)
57
57
(C)
58
58
(D)
59
59
(E)
61
61
Answer
Correct choice: (C)
正确答案：（C）
Solution
The smallest prime is 2, which is a factor of every even number. Because 58 is the only even number, it has the smallest prime factor.
最小的质数是2，它是每个偶数的因数。因为58是唯一偶数，所以它有最小的质因数。
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