北京大学ACM比赛题目
In 1742, Christian GoldBAch, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture:
Every even number greater than 4 can be
written as the sum of two odd prime numbers.
For example:
8 = 3 + 5. Both 3 and 5 are odd prime numbers.
20 = 3 + 17 = 7 + 13.
42 = 5 + 37 = 11 + 31 = 13 + 29 = 19 + 23.
Today it is still unproven whether the conjecture is right. (Oh wait, I have the proof of course, but it is too long to write it on the margin of this page.)
Anyway, your task is now to verify GoldBAch s conjecture for all even numbers less than a million.
标签：
mathematician
Christian
GoldBAch
Leonhard
上传时间：
2016-04-22
上传用户：wangchong
