2,3,4,5,6,7,8
If the minimum number is greater than 2, then the prime number can only be odd, and among the seven consecutive numbers, there are only four odd numbers at most, so it is impossible to have more than four prime numbers.
Therefore, there are at most four prime numbers.
At least 0,
take for example
2 12,2 13(=3×7 1),2 14,2 15(=5×43),2 16,2 17(=7×3 1),2 18
These seven numbers are all composite numbers.
Natural number is a qualitative concept defined for a class of numbers in mathematics. Natural numbers are a set of positive integers including the number 0. We can also call positive integers natural numbers alone. Natural numbers can be used to measure the order of things in life, or the number of things. There are countless natural numbers.
According to the parity of numbers, we can divide natural numbers into odd numbers and even numbers, and the number 0 belongs to a special even number. In addition, we can also call natural numbers a set of 0, 1, composite numbers and prime numbers.
The so-called composite number refers to a positive integer (except the number 0) that can be divisible by numbers other than the remainder of 1. A prime number is a positive integer that can only be divisible by 1 and its own value (except 1 and 0).
Any natural number must be an integer or a number greater than or equal to 0. For the operation of natural numbers, except addition and multiplication, the final result must be a natural number, while in subtraction and division, the final result is not necessarily a natural number.
The nature of natural numbers:
1. You can define addition and multiplication for natural numbers.
2. Orderly. The orderliness of natural numbers means that natural numbers can be arranged in order from 0 without repetition or omission.
3. Infinite. Natural number set is an infinite set, and the sequence of natural numbers can be written endlessly.
4. transitivity: let n 1, n2 and n3 be natural numbers, if n1>; N2, n2 & gtN3, then n1>; n3 .
5.Trigement: For any two natural numbers n 1, n2, there exist and only exist the following three relationships: n1> N2, n 1=n2 or n 1.