The eerie number seven

Whether in the East or in the West, 7 is considered to be a very mysterious number, and scholars in many fields today have an unusually high esteem for this number, and according to a study in the United States, most people in the world regard 7 as their lucky number, and the ideal sleep time for humans is seven hours a day, and the mystery of 7 can be seen here. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

In psychology, 7 is the most incredible number of scholars, most people have a maximum of 7 short-term memory capacity, and if it exceeds 7, forgetting will occur, so most people will classify the memory content within 7 units.

Many things in life are closely related to 7, and everything related to 7 makes people feel magical: PH is only neutral when it is 7, people have seven orifices, sunlight is composed of 7 colors, there are seven days a week, women's menstrual cycles are generally 7 days, there are seven notes in the simple score, the seven star ladybugs, the Big Dipper, and the seven continents......

And in the mysterious number found in the pyramid, 142857 in the calculation, 1, 2, 3, 4, 5, 6 are divided into 7, they are all infinitely cyclic decimals, for example:

1÷7＝0.1428571

2÷7＝0.2857142

3÷7＝0.4285714

4÷7＝0.5714285

5÷7＝0.7142857

6÷7＝0.8571428

Looking at the results of the above calculations, we find a lot of interesting points:

1. The cyclic section of the decimal part is in the 7th place.

2. The numbers in the decimal part will not change, but the position will be exchanged.

3. Multiples of 7 that are not multiples of 7 add up to multiples of 7, for example:

1＋2＋3＋4＋5＋6＝21

36＋37＋38＋39＋40＋41＝231

8＋9＋10＋11＋12＋13＝63

Go on...

Let's take this mysterious number obtained by dividing 7 points by 1 part and multiply it from 1 to 6.

142857＊1＝142857

142857＊2＝285714

142857＊3＝428571

142857＊4＝571428

142857＊5＝714285

142857＊6＝857142

The same number, just reversed, appears over and over again. So how much is multiplying it by 7?

What we will be surprised to find is 999999

And 142 + 857 = 999

14＋28＋57＝99，

Finally, we 142857 multiply and 142857

The answer is: 20408122449

What is the number of the first five digits plus the last six?

20408＋122449＝142857

There are no heptopods or insects in nature, but there are horse chestnut plants; However, it must be a plant with head leaves and leader leaves to have odd leaves such as 7, 9, and 11. The Yellow River Basin, Beijing, Jiangsu and Zhejiang are all planted with horse chestnut trees, and the horse chestnut is abundant in Liangguang, Guizhou and other places. The existence of a large number of such seven-leaf plants shows that although "7" is mathematically asymmetrical and irreducible, in the biological world, the head leaves are in the middle, in pairs and twos, and the odd number of leaves with lush branches can be compared to the rational structure of human beings who "have head leaves and leader leaves".

We can also do an experiment and find a random piece of paper, fold it in half, and you will be surprised to find that this paper can only be folded in half a maximum of 7 times.

In the legend, 7 is more mysterious, the seven-pointed star was once forbidden to be used by humans, it is regarded by the occult as a more complex and powerful pattern, it is difficult to draw, because the seven-pointed star is an uneven but perfect and stable one, and the Bible has a record of God's creation of man in seven days.

Many people know that Buddhism has three souls and seven spirits, seven emotions and six desires. And now there is still a saying among the people that the first seven resurrect souls, and the seventh and a half of each year is also a Halloween festival that has been handed down......

The first seven: a funeral custom. It is customary to think that the "first seven" refers to the seventh day after a person's death. It is generally believed that the soul of the deceased will return home on the "first seven", and the family should prepare a meal for the soul of the deceased before the soul returns, and then must avoid it, the best way is to sleep, and if you can't sleep, you should hide under the covers; If the soul of the deceased is allowed to see his family, it will make him remember, and it will affect his reincarnation.

In the middle of July: On that day, all the ghosts were released from the prefecture, and the people generally carried out activities to worship the ghosts. Where there is a new mourner, for example, to go to the new grave, and generally in the local sacrifice to the lonely soul and wild ghosts, so it is a festival centered on worshipping ghosts, which is one of the largest Chinese folk festivals.

All of the above is intended to illustrate the mystery and weirdness of the number 7, and the story of this book has a lot to do with this number.