1in the spring of 966, Chen Jingrun announced to the world that he had reached the best result about Goldbach's conjecture (1+2), that is, any even number large enough can be expressed as the sum of two numbers, one of which is a prime number and the other is the product of no more than two prime numbers. 1966, Chen Jingrun's paper was published in 17 issue of Science Bulletin.

(The original is more than 200 pages, which is jumbled. )

1972, Chen Jingrun improved the ancient screening method, completely and beautifully proved (1+2) in Goldbach's conjecture, and improved the paper of 1966.

1973 China Science Journal officially published Chen Jingrun's paper "A big even number is the sum of the products of a prime number and no more than two prime numbers". The title of this paper is the same as Chen Jingrun's paper 1966 published in Science Bulletin in June, but the content is brand-new and the article is concise.

The typesetting of this paper is also quite laborious. Because there are many mathematical formulas and symbols in the paper, and many of them are nested in multiple layers, it is very difficult to spell them out. The printing house of the Academy of Sciences sent Ou Guangdi, a senior compositor, to operate for a whole week.

So I posted Mr. Chen Jingrun at the beginning of the paper:

Let P_x( 1, 2) be the number of prime numbers P suitable for the following conditions:

X-p=p_ 1 or x-p=(p_2)*(p_3)

Where p _ 1, p _ 2 and p _ 3 are all prime numbers.

X represents a sufficiently large even number.

Life CX = {∏ p | x, p2} (p-1)/(p-2) {∏ p2} (1-1(p-1) 2)

For any given even number H and sufficiently large X, xh( 1, 2) is used to represent the number of prime numbers P satisfying the following conditions:

P ≤ x, p+h = p _ 1 or h+p = (p _ 2) * (p _ 3),

Where p _ 1, p _ 2 and p _ 3 are all prime numbers.