Traditional Culture Encyclopedia - Photography major - What is a prime number and what is a prime number?
What is a prime number and what is a prime number?
Prime number is a concept in mathematics, that is, the common factor of two or more integers is only 1.
Prime numbers have the following theorems:
(1) Two nonzero natural numbers whose common factor is only 1 are called prime numbers; For example: 2 and 3, the common factor is only 1, which is a prime number;
(2) A positive integer whose greatest common factor is only 1 is called a prime number;
(3) Two different prime numbers are coprime numbers;
(4) 1 is coprime with any natural number. Two different prime numbers are coprime. A prime number and a composite number are coprime when they are not multiples. The coprime of two complex numbers without the same prime factor;
(5) Any two adjacent numbers are coprime;
(6) The probability that two positive integers are prime numbers (the greatest common divisor is 1) is 6/π 2.
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