Thursday, 5 November 2015

Unit 3 sec 1.3

     You have seen every natural number greater than 1 has at least two factors, itself and 1. Natural number that has exactly 2 factors is told of prime number, or just prime. The number 1 is not prime number, as it has only one factor, namely 1.

  The prime number under 100
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

   Prime numbers play a central role in both abstract and real-world mathematics. Prime numbers are often using encryption systems that are used to protect confidential information when it is transmitted electronically stop mathematicians have proved many fearing about prime numbers, and they are still working to prove many conjectures.


   There are infinitely many prime numbers - this is proved more than 2000 years ago by the Greek mathematician Euclid. Despite this, it is difficult to identify very large prime numbers.

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