C28 I Am Studying Goldbach's Conjecture

"Qin Luo, get up and tell me how you solved this question." At this moment, Lee Wei's "kind" words pulled Qin Luo back to reality.

Record SN was the first N of the equal-difference series and always A1-7S3 = -15.

(1) Seek the general formula of 'An'.

(2) Ask for SN, and ask for the minimum value of SN.

This was the problem of the smallest value of an equal-rank number.

The first question was relatively simple. It was enough to only ask for the general formula, but the difficulty of the second question suddenly increased.

Not only did it require value, but it also required the lowest value.

Teacher Lee is creating an opportunity for me to show off.

What a good teacher that only appears once in a hundred years.

At this moment, in Qin Luo's eyes, Lee Wei is no longer a black faced evil god, but a little white flower without sorrow.

Qin Luo walked to the blackboard and picked up the chalk, but did not answer immediately. He fell into deep thought.

Should he use that kind of method to show off?

Five minutes passed. Qin Luo did not write a word. He stood in front of the blackboard and stared blankly.

"Qin Luo!" Lee Wei's face was ashen as he scolded, "What are you waiting for?"

"Emm, I am thinking of that method to solve it."

"What? You have several other methods?" Lee Wei was interested. He was curious about how Qin Luo could "create" a solution.

"Not many, not many. There are only three ways."

... ""

"The first type." Qin Luo raised his hand and wrote a big sentence on the blackboard, then quickly began to solve the problem.

"Setting up the official difference to D, from the question you will know 3A1 + 3D = -15."

From A1 = -7 to D = 2.

The general formula of the 'n' is an = 2n- 9

(2) From (1), SN = N-8N = (N-4), so when N = 4, SN is the lowest value, and the lowest value is -16.

"The second type."

Qin Luo did not stop, and continued writing.

"F * (Mi Rong) * (B-A) = F (B) F (A)... Minimum value is -16."

"The third general formula is an = 2-9..."

One, two, three!

The results of the three methods were exactly the same!

However, each method was different.

Silence, a deathly silence.

None of the 47 students in the classroom spoke.

It wasn't that they didn't want to speak, but that they had nothing to say!

Qin Luo was so powerful that he could even use the contents of the university. Could they say anything?

One had to know that knowing was one thing, but being flexible was another.

The fact that Qin Luo could use the college method to solve the problem proved that he was already familiar with the method.

"You used the disintegration method for the last method?" After a long silence, Lee Wei broke the silence in the classroom.

"Yes." Qin Luo nodded.

"Where did you learn it?"

"I learned it by myself."

"Where did you learn it from?" Lee Wei asked again. This was the content of the university. It was slightly related to the high school elective textbooks.

"The Lagrange Central Value theorem and Ptolemaic theorem."

Lee Wei was stunned. "You are self-studying 'Higher Numbers'?"

"Yes, but I have been studying Goldbach's conjecture recently."

500 genius points. Qin Luo was drooling over him.

... "" A second ago, Lee Wei was still bursting with joy, but a second later, he was speechless as if he had eaten a fly.

Goldbach guessed that it was something a high school student could come up with. Do you think you are Tao Zhexuan or Qiu Chengtong?