I kidnapped an alien civilization

Li Mo was immersed in the history told by the Pajero people with his big head for a long time, but he did not expect that the dominant Gudu beast was wiped out by the Pajero people so dramatically.

"New task release", the learning system sounded a notification tone.

Mission: Boy, keep up the good work.

Explanation: If you don't accumulate steps, you can reach a thousand miles without a single step. If there is no accumulation of small currents, there will be no rivers and seas. Do not slack off in learning.

Requirements: Solve an unsolved mathematical problem.

Reward: 200,000 subject experience points, one general lottery draw.

Time limit: 30 days

Accept: yes/no

This task required solving an unsolved problem in mathematics, and Li Mo accepted it "happily". He had solved two problems before, and he had a lot of experience.

Li Mo, who returned to Yanda, was not greeted with flowers or applause. No one even knew what he had done, but his heart was full of joy, because he saved a person's life, which was the greatest compliment to Li Mo.

Department of Mathematics, Prof. Wu's Office

Li Mo took the initiative to pour a cup of tea for Professor Wu, "Teacher, I have been busy a while ago and neglected the study of mathematics. I am here to criticize you."

This kid, Professor Wu looked at his actions, wanted to be angry but couldn't find a reason. He knew that Li Mo must have carried out an extremely important biological experiment, and he heard that there was a student in the Department of Biology who was in the late stage of frostbite, and now he could go to school with a stick every day. I'm afraid it's not his student's masterpiece, but Li Mo doesn't want to say it, so he doesn't ask. For this kind of gifted student, he just needs to be more tolerant.

Professor Wu smiled and said, "Okay, okay, now that you've finished the biology experiments, it's time to turn your attention to mathematics."

Li Mo came here this time because he wanted to choose a branch of mathematics as a research object.

He replied: "Of course, as a graduate student in the Department of Mathematics, I should have made some achievements in mathematics."

Professor Wu was very satisfied with his attitude, tasted the tea served by his lover, looked at the green tea leaves swirling in the cup, and asked kindly: "Then which subject do you want to choose as your research object?"

"I don't know if the teacher has heard of the odd perfect conjecture?" Li Mo asked mysteriously.

"You..." Professor Wu suddenly felt that the tea in his mouth was so hot that he almost vomited it out.

"Are you going to study the odd perfect conjecture?" Professor Wu calmed down, but luckily he didn't lose face in front of the students. But the subject raised by his student was astonishing.

The odd number perfect conjecture is a conjecture with a history of thousands of years. Its specific description is whether there is an odd number that is a perfect number among natural numbers. A perfect number is a perfect number (must be a natural number) that is equal to itself if the sum of all its factors except itself is added. For example, 6 is a perfect number. Since 6=1×6=2×3, besides itself, 6 has divisors of 1, 2, and 3. It can be seen that the sum of these three divisors is 1+2+3=6, which is exactly equal to 6 itself. In addition to 6, there are 28, 496, 8128...all perfect numbers.

By enumerating, it can be seen that all perfect numbers are even numbers. So is there such an odd number that makes it itself a perfect number?

This conjecture seems simple, but countless mathematicians have fallen at its feet. Euler, Euclid, Descartes, and Nico Matthews have all studied this question, but none of them has a clear answer.

So Professor Wu was really surprised that his students would choose to decipher such a "smelly and hard" conjecture as a research topic. Not to mention that this problem is extremely difficult, it is not the frontier of current mathematical research. Nowadays, many talented graduate students in mathematics will take group theory and topology as their research topics, so that even if they fail to achieve results, they can write a few papers.

Professor Wu looked into Li Mo's clear eyes, hesitated and said, "Why don't you think about it again? No one has proven this conjecture for thousands of years. It's too difficult."

Li Mo knew the teacher's kindness, he looked at the sunshine through the window and said: "Mathematics is to face difficulties and retreat, and I like numbers very much, numbers are the foundation of mathematics."

For the first time, Professor Wu felt powerless for his students. He began to miss those "stupid" students who would follow their own words as dogma.

He could only nod his head and said, "The odd-number perfect conjecture has been studied by many well-known mathematicians in history. You can avoid many pitfalls by referring to their proof ideas." For such a difficult conjecture, Professor Wu is beyond his reach. , can only provide some empirical reference.

Li Mo nodded, "Never forget the past, and guide the future. I will study the achievements of the predecessors first."

After the conversation, Li Mo got up and left. Professor Wu looked at his back and said with emotion: "Having such an excellent student is also a kind of trouble. I feel that I have no knowledge to teach him."

"No, I don't seem to have taught him anything!" Professor Wu patted his head.

The campus was still as quiet as ever, and students in twos and threes walked along the road side by side, talking and laughing. On the sports field, some students even let the wind blow, and there was a warm scene everywhere. After nearly a month of running around, Li Mo feels that he still prefers school life.

"Boss, you're back? Let's eat right now." Xia Qing was cooking in the dormitory, when Li Mo came back, she put the food on the table.

Now Xia Qing doesn't have to follow him all day long, because under Li Mo's strong protest, they have reached an agreement with three chapters: "1. Xia Qing can't follow Li Mo all day in the campus. 2. Out of the campus, Xia Qing Qing has the right to personally protect Li Mo. 3. Xia Qing has the right to modify the first article at any time."

Compared with the complicated situation outside the campus, Yanda is much safer inside. Under Li Mo's resolute protest and the approval of the Security Bureau, Xia Qing decided to implement Li Mo's "free-range feeding" in the school.

In Xia Qing's free time, she would go to the music department to take classes during the day. She liked music since she was a child, and even wanted to be a musician at one point, but she didn't have the conditions at that time. Now staying at Yan University, she will naturally not let go of this good opportunity. And the teachers of Yanda don't mind the "extra" students. In the evening, Xia Qing would come back early to prepare dinner for the two of them.

"Your roasted eggplant tastes really good." Li Mo sat at the dining table and tasted the dish. Although Xia Qing had a bad temper, she cooked it well.

After dinner, Xia Qing would take a walk along the lake, while Li Mo "hid" in his room and began to study the "odd perfect conjecture".