"Big brother, you can do it, I can't eat a lot." Ye Ming folded his hands and bowed his body, looking pitiful.

"No, to be kind to others is to be cruel to yourself, I'm sorry, brother." The fat man is still resolute.

I thought to myself, after all, that it would be better to have one more friend than one more enemy in such a place, so I said, "You can eat as much as you want, but you have to do something for us." ”

"What is the effort?" Ye Ming asked puzzled.

"Long Shao, don't make your own decisions, don't forget, everyone is a team now!" The fat man shouted dissatisfiedly.

I leaned over to the fat man and whispered in his ear: "Fool, now that there is a thunderstorm for us, why don't you shut up for me quickly." ”

The fat man was stunned for a moment, and then understood what I meant, we walked through a few rooms before, and encountered a lot of mechanisms, but fortunately, every time we used the sticks thrown out, but no one can guarantee that in the next room, there will be no mechanisms that cannot be detected by sticks, since Ye Ming is here, I don't mind letting him take the lead.

"That's okay, it's okay to give you food, but then you have to listen to us, otherwise, you go yours, we go ours, and we will never meet you." The fat man has his face up, his nostrils facing the sky, which means that if you don't agree, you have to agree.

Ye Ming saw that the fat man was relieved, and hurriedly said: "Okay, I will do whatever the fat man asks me to do, everything is up to you." ”

I then took out some dry food from my bag and gave it to Ye Ming, and then gave him a bottle of mineral water, "You have to save some drink, this water is our most important resource, and there is not much left." ”

Ye Ming promised in his mouth, but his hand couldn't wait to grab the dry food, it seems that he is really hungry, we wait for him to finish eating, and then walk to the next room.

I turned the handle, opened the door, and then climbed into the hole, and then threw the stick into it, at this time, the whole room suddenly erupted a thick green mist, I looked, and quickly pulled the stick out, but, before the stick was pulled out, the rope had been corroded and broken, at the same time, the green mist spread quickly to my side, I quickly withdrew from the hole, and quickly tightened the handle.

When Ye Ming saw the rotten rope, he couldn't close his mouth in shock, "This....so powerful?" ”

"It's a pity, the stick fell inside." I said with a frown.

"You, take off one of your shoes!" The fat man glared at Ye Ming and said.

"Huh? This... Not suitable, right? Ye Ming said a little reluctantly.

"Why is there so much nonsense? Do you want to take it off? Do you want me to help you, fat man? The fat man was about to step forward.

"Okay, can't I take it off?" After Ye Ming finished speaking, he bent down to untie his shoes.

He took off a boot and handed it to the fat man, who took it and glanced at it, and quickly covered his nose, "You haven't taken a fucking shower for a few days?" Then he handed me the shoes.

"Xinyi, do you still have a rope? I'm afraid this section in my hand is not long enough. I turned to Xie Xinyi and said.

Xie Xinyi took out another piece of rope from her bag and handed it to me, "The last one, if there is another accident, it will not be easy to handle." She said with a frown.

"I'll try to be careful." After speaking, he tied Ye Ming's shoes with ropes.

I unscrewed the handle of the other room again, then got into the hole and threw my shoes into it with all my might, but this time the room didn't respond, so I withdrew.

"You come first." I looked at Ye Ming and pointed to the entrance of the cave and said.

"What? Why me?" Ye Ming asked a little stunned.

"Why? Just because we give you food, there is a reward for paying, hurry up. The fat man urged from behind.

Ye Ming swallowed a mouthful of spit and asked a little worriedly, "There won't be any accidents inside, right?" ”

"This is not guaranteed, if you regret it now, it's still too late, we won't force you, but food and water, we can't supply it." I said with a calm face.

"Okay, I'll go in, it's better than starving." After Ye Ming finished speaking, he gritted his teeth and climbed in.

He cautiously jumped in, nothing out of the ordinary, and then beckoned to us, "Come in, safe." ”

"You go inside." The fat man said a little uneasy.

Ye Ming answered, and turned around again, and when we saw that there was no accident, we all came over.

When I was drilling the hole, I suddenly noticed a row of numbers engraved on the hole, "343,121,169.".

I got out of the hole and thought hard about the meaning of these numbers, and when the fat man saw that I didn't speak, he asked, "Long Shao, what's wrong?" Is something wrong? ”

"Did you notice the numbers on the hole?" I asked the fat man.

"I've seen it, but I don't really care, what's the point of the number?" The fat man asked suspiciously.

"I don't have a clue when I think about it, is it the code for each room?" I said with a blank look on my face.

"What? If it's code, then we're stuck here. Xie Xinyi, who was on the side, said suddenly.

The fat man was stunned after hearing this, and said a little stammering: "No, isn't it?" ”

"I also noticed the code of this hole, it seems to be three three-digit numbers, if it is a room code, then there are tens of millions of rooms here." Xie Xinyi said with a smile, as if she herself didn't believe in such an inference.

I also smiled slightly after hearing this, "Don't be kidding, it is impossible to build so many rooms with such a precise structure, we have only walked more than twenty rooms now, if there are tens of millions, if you don't have to go out, you will have to starve to death here." ”

I saw that Shu Muhua on the side kept bowing his head and was silent, so I asked, "Uncle, what do you think?" ”

Shu Muhua smiled slightly, "Xiaotian, in fact, I noticed those numbers from the beginning, but I didn't say it all the time. ”

I was stunned, "Oh? Did you find anything? I then asked.

"I've always remembered the room numbers we came all the way over, and now there are more than twenty, so I can guess the pattern." Shu Muhua said with a smile.

"Uh... Uncle, have you memorized so many numbers? You're not going to be here with us, are you? ”

Shu Muhua saw that I didn't believe it, and then laughed, "Not only can I remember the numbers, but I can also remember the route of the room we walked to, this is my innate talent." Shu Muhua said proudly.

"Well..., we believe it, tell me what you have discovered, old comrade." The fat man interjected.

Only then did Shu Muhua hold back his smile and say, "Do you know prime numbers?" ”

The fat man scratched his head after hearing this, looking like he didn't know anything, "Prime numbers? What is it? ”

"Prime numbers are numbers that are only divisible by themselves, hey! Fatty, you're uneducated, it's terrible. Xie Xinyi covered her mouth and said with a smile.

"The little girl is so smart, haha." Shu Muhua said after listening.

"This prime number, I learned it when I was in school, and I also memorized the prime number table, but now I guess I have almost forgotten it, and I can only judge whether he is a prime number by calculation, what, is there a connection between the numbers in this room?" I asked, puzzled.

"I'm not 100% sure yet, but it's really connected, do you remember the room number we just came over?" Shu Muhua asked.

“343，121，169。” I said without thinking.

"All three are prime numbers." Shu Muhua said.

I tried to do the math, and it was really a prime number, "I said, uncle, aren't you a mage in the clan?" Why is math still so strong? Don't you know how to spell? ”

"What spell? I'm in charge of the calendar......" Shu Muhua said with a glare.

"Poof! Xiaotian, you can really pull it, haha......" Xie Xinyi laughed after hearing this.

I scratched my head and said a little embarrassedly, "No wonder math is so good, then you go on, what else do you find?" ”

"All rooms that pass through safely, the room code is prime!" Shu Muhua said excitedly.

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