What is a twin prime?

It refers to (3,5)(5,7)(9,11)...... （857，859）（881，883）…… Wait for two pairs of prime numbers with a difference of 2, and write it out as (P, P+2).

In 1849, Alfon de Polliniac proposed a conjecture that for all natural numbers k, there are infinitely many pairs of prime numbers (p, p + 2k). The case of k = 1 is the twin prime conjecture.

In the report of the International Congress of Mathematicians in 1900, the famous German mathematician David Hilbert formally proposed it on the eighth problem and gave a canonical description.

There are infinitely many prime numbers p, such that p + 2 is prime.

This is the twin prime conjecture.

Due to its high correlation with Goldbach's conjecture, countless mathematicians have been challenging it in the past 100 years, and the most recent stage victory is that Zhang Yitang proposed a finite interval method to prove that "infinitely many prime numbers p, p+70 million". And then the gods shrunk 70 million to 246 according to his method.

Not to mention proving it, even if it is "found", it will take countless computing power.

GIMPS, which uses multiple computers for distributed network computing, specializes in this job. Although it is used to find Mason primes, there are only so many prime numbers, who is not looking for them?

This shows that it is not easy to find prime numbers.

But Ita, who was able to use the time she called "taking a nap", casually cited the 532 pairs of the largest known twin prime pairs......

This gap in computing power, Ye Ming no longer has an intuitive understanding.

If you have to compare, it is her calculation speed, which is probably several exponential "Nine Chapters" stronger than the current strongest supercomputer, the little devil's "Fuyue".

……

"Traditional human computers use the disconnection and connection of circuits to represent 0 or 1, so as to realize the expression and calculation of binary numbers."

Ye Ming sat cross-legged on the bed, closed his eyes, and whispered in his mind.

At a glance, it looks like he is practicing some kind of magic skill.

Ita's voice came to my head: "Are you giving me a review of circuit knowledge?" ”

"No, I'll teach you what a logic gate is."

As Ye Ming answered, he also concentrated and "drawn" a standard door structure in his mind.

"Can you see it?"

"Yes."

Ita also drew a repeat one.

"With gate, when input A and B are in high state 1 at the same time, the value of its output is 1, and all other times it is 0."

"Got it."

"You line up a few different doors and come up with an answer."

"Underestimate me." Ita was like an unconvinced genius schoolboy, and immediately after replying, a long row of doors immediately appeared in his mind: "10101011001"

"Convert to decimal system."

“1369”

"Hmm." Ye Ming remained silent: "Go on, the next step is the non-door, or the door...... ...... with NAND gates"

"Why are there so many doors?"

"Because...... There is so much logic. ”

……

The door of the dormitory was silently pushed open, Peng Xiaofei poked his head out, and he saw Ye Ming sitting cross-legged on the bed, holding a book in his hand, frowning, and still having words in his mouth......

was startled at first, and then he walked lightly in front of Ye Ming.

He breathed a sigh of relief when he saw that the book had an integrated circuit design on the cover.

"Ye Ming!"

"What?"

"Lao Tzu still thinks you're practicing magic skills...... Peng Xiaofei picked up the book with a smile: "This is what I learned next semester, right?" Are you going to memorize it now? ”

Ye Ming snatched the book back: "Let's get down to business." ”

"The main thing is that I only received a notice from the RC organizing committee this morning, and this year's domestic and international races ...... It may have to be changed to an online event. ”

Ye Ming said: ", how can you compare online?" ”

"It's said to be a video." Peng Xiaofei was also unhappy: "No way, because of the epidemic." You said that Ah San's side is okay, even if we go, we will be a little weak-hearted, there is no need to be so serious in China, right......"

As soon as it came to the epidemic, Ye Ming knew that there was nothing to say, and he frowned: "If you send a video, then you can only see which team's R2 robot is faster, and there is no confrontation at all." ”

Peng Xiaofei nodded: "Yes, so I think, is this fucking deliberately targeting us......"

“…… What did Mr. Chen say? ”

"I'll call you to a meeting."

"Let's go."

……

Ten minutes later, the two appeared together in the preparation hall.

After briefly explaining the situation, Mr. Chen looked at Ye Ming with a smile: "I have the same opinion as Peng Xiaofei, it is estimated that the organizing committee saw that our self-aiming and defense were too buggy, so we deliberately changed it to online." ”

Everyone laughed in unison.

Mr. Chen's remark was of course a joke.

"But since we have already decided to change it to online, it means that we don't have to worry about watching and defending, and we can just make every effort to optimize the plan of building blocks - in fact, this is what I said before, RC games focus on the completion of the final task."

"If we think of the final completion of the building block tower as a task of the robot in reality, then throwing the ball and dodging the ball are just interference with this task."

"Now, it's just that there are no distractions, and we can concentrate on completing our tasks."

Listening to Mr. Chen's analysis, everyone nodded silently.

After Lao Chen served as an instructor, he didn't bring much technical support to the team, after all, everyone had already completed the final upgrade at that time. What he offers is still the idea of competition. Therefore, in the final face of Wuda, Ye Ming did not seek to defeat the opponent, but formulated tactics around interfering with the opponent's R2, and finally won the game.

I have to say that ginger is still old and spicy.

"You can start from a few aspects." After Mr. Chen finished speaking, he looked at everyone with a smile.

Everyone was silent, and finally looked at Peng Xiaofei.

- Peng Xiaofei is the operator of the team, and the pressure is all on him.

And Peng Xiaofei "brushed" towards Ye Ming.

Looking at his friend's gaze for help, Ye Ming shook his head with a smile.

He thought for a moment and said, "I think we can maybe start with the process." ”

Teacher Chen immediately looked at him: "What do you say?" ”

"Look, everybody." Ye Ming turned his head as he spoke, pointing to the building block tower that had been erected in the field: "Let's start with the distribution of the tower after it is knocked down, and get an optimal angle and strength of hitting the tower - it is a bit similar to ......"

Before Ye Ming's words fell, Peng Xiaofei jumped up instantly.

"I know!"

Everyone looked at him again.

Ye Ming also raised his chin with a smile: "What do you know?" ”

"Billiards kick off!"

"Hey, smart!" Ye Ming applauded.

The crowd burst into laughter.

"Yes, tee off." Mr. Chen bowed slightly, and his eyes were full of appreciation: "Prescribe an optimal distribution that is conducive to the construction of R2, and then optimize the path of R2." ”

Li Dongsheng slapped his face: "You can also learn from Wuhan University!" We're just too honest, picking up block by block, and this time, we're going to pick up three at a time! ”

Teacher Chen nodded after a slight hesitation: "But that involves the change of R2's task robotic arm, is it too late?" ”

Hearing this, everyone looked at Ye Ming again.

Ye Ming shrugged.

Of course it's in time, half a day's thing.