Two, three, five, seven, eleven.

One, three, nineteen, seventeen

Two, three, two, nine, thirty-seven

Three one, four one, forty seven

Four, three, five, three, fifty-nine

6 1, 7 1, 67

Seven, three, eight, three, eighty-nine

Add 79, 97

Prime number 25 cannot be less.

Write it down to 100%

Look left and right. Are you all here?

It turned out that it was 97 short.

Extended data:

In the sequence of natural numbers, prime numbers are integers that can only be divisible by 1 and itself, such as 2, 3, 5, 7, 1 1 and so on. 4, 6, 8, 9 and so on are not prime numbers. Because each natural number can be uniquely decomposed into the product of finite prime numbers, to some extent, prime numbers constitute the cornerstone of the natural number system, just as atoms are the foundation of the material world.

1, there must be at least one prime number between a number greater than 1 and its twice (that is, within the interval (a, 2a)).

2. There is a prime arithmetic progression of any length.

3. An even number can be written as the sum of two composite numbers, and each composite number has at most 9 prime factors. (Norwegian mathematician Brown, 1920)

4. Even numbers must be written as prime numbers plus composite numbers, in which the number of factors of composite numbers has an upper bound. (Renee, 1948)

5. Even numbers must be written as a prime number plus a composite number consisting of at most five factors. Later, some people called this result (1+5) (Pan Chengdong, China, 1968).

6. A sufficiently large even number must be written as a prime number plus a composite number consisting of at most two prime factors. Short for (1+2)

People's interest in prime numbers can be traced back to ancient Greece, when Euclid proved that there are infinite prime numbers in natural numbers by absurd methods, but he knew nothing about the distribution law of prime numbers. With the deepening of research, people are more and more confused about strange prime numbers. These maverick prime numbers, after appearing in front of the public from time to time in the ocean of natural numbers in Wang Yang, left a deep impression on people who came here through hardships, and then walked away.

1737, the Swiss genius mathematician Euler published the Euler product formula. In this formula, the ghostly prime number is no longer unscrupulous, and finally shows people its well-behaved side.

Along the battlefield opened by Euler, Gauss, the prince of mathematics, and Legendre, another master of mathematics, deeply studied the distribution law of prime numbers, and finally independently put forward the groundbreaking prime number theorem. This theorem gives the approximate distribution probability of prime numbers in the whole natural number, and it is very consistent with the actual calculation. After playing hide-and-seek with people for more than 2000 years, the prime number finally showed a beautiful fox tail.

References:

Baidu encyclopedia-prime number