題目是說k, n都是比2大的質(zhì)數(shù) 而且相差4, 如果k,n之間沒有質(zhì)數(shù),問你k+n的最小值是多少
假設(shè)k比n大, 你可以就一個一個想過去
譬如n = 3, k = 7 但是之間有5是質(zhì)數(shù),
下一個n可能的質(zhì)數(shù)是5, k = 9,但是9不是質(zhì)數(shù),所以也不可能
用這么思路的話可以發(fā)現(xiàn)最小的n是7, k =11 而且8, 9, 10沒有一個是質(zhì)數(shù)
所以最小的k+n = 18
數(shù)學真題一道
數(shù)學真題一道
Prime numbers k and n are each greater than 2,and they differ by 4.If there is no prime number between k and n,what is the least possible value of k+n?
Prime numbers k and n are each greater than 2,and they differ by 4.If there is no prime number between k and n,what is the least possible value of k+n?
英語人氣：182 ℃時間：2020-05-20 18:13:30
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