Which is the three smallest digits
As is well known, is one Prime number a natural number different from 1 that has no factors other than 1 and itself. Even in antiquity, Greek mathematicians knew that every natural number can be uniquely decomposed (except for the order of the factors) into a product of prime numbers and that there are an infinite number of different prime numbers. In Book IX of the elements of Euclid (around 300 BC) there is the following Proof of contradiction: If one assumes that there are only finitely many prime numbers, for example, then the number is greater than all these prime numbers and is not shared by any prime number. So m is itself a prime number, a contradiction to assumption.
With the help of Sieve method of Eratosthenes (around 200 BC) one can find every prime number one after the other as follows. You start with the infinitely long list of all natural numbers greater than 1. In it, the smallest number, 2, is a prime number. You remove all their multiples from the list. The smallest number in the remainder of the list that is greater than the prime number just found, in this case 3, is the next prime number. You now remove all their multiples from the list, etc.This results in the following prime numbers from 1 to 1000:
The hunt for large prime numbers
Of course, this theoretical method is not practical to quickly generate an arbitrarily long list of prime numbers. Up to now, no formula is known that allows to calculate prime numbers of any size quickly, or to produce an even larger prime number from a given prime number.
Therefore, with the current state of research, there is always a currently largest known prime and the current record stands at
It is by no means the case that all prime numbers below this very large number are known, as would be the case with Eratosthenes' sieving process. Such a number can be determined with the help of the Mersenne numbers. So this number is itself also a Mersenne number.Furthermore, one can also determine special relationships for certain prime numbers. So there is for example
- Prime twins, which are two prime numbers that have a difference of two.
Specific examples are 5 and 7, 11 and 13, 17 and 19, 29 and 31, 41 and 43, ..., where the largest known twin prime pair is 33218925 * 2 ^ 169690 +/- 1.
To date, however, it is unknown whether there are an infinite number of prime twins.
- Prime triplets, which always contain three prime numbers, each of which has a difference of two. Since every third odd number is divisible by three, there is only one triplet (3, 5, and 7).
- Prime quadruplets, each characterized by two prime twins that are only four numbers apart. Examples would be: 11; 13; 17; 19 or 101; 103; 107; 109
In the Prime factorization the fundamental theorem of arithmetic applies. This means that every positive integer can be clearly represented as a product of prime numbers except for the sequence. The prime numbers appearing in this representation are called the prime factors of the number. The difficulties involved in prime factorization are known as factoring problems. But one tries to minimize them with suitable factoring methods. Since every natural number can be written as a product of prime numbers, the prime numbers occupy a special position in number theory. They therefore occupy a position similar to that of atoms in chemistry.
The Sophie Germain primes are a whole class of primes that have played an important role in certain number theoretic investigations. Another interesting class of prime numbers, which are closely related to the ability to construct regular corners using only compasses and rulers, are the Fermat prime numbers.
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