Question

how is possible calculate every prim numbers from 2 till ... the end - how,what is this formula ... so if may be this exist today,anywhere in present ? - or this is very very difficile to create it ?

Answer 1

prime number fascination has been around a long long time :) a cant recall any of the formulas they tried but its a fun research topic

Answer 2

there are infinite number of prime numbers. no formula can calculate all of them. but computer programs can help

Answer 3

if we multiple for example : 1x2=2+1=3
2x2+1=5 --- 2x3+1=7 --- 2x5+1=11 ---

Answer 4

or 2x3x5+1=31

Answer 5

2*7+1 =15 (not prime)
I cannot say how reliable this method is.
It does not seem to follow a fixed pattern

Answer 6

yes always exist exceptions

Answer 7

kid in algebra class had the idea that if it ends in a 3 its prime; I was like really? so when they got to 33 I just smiled :)

Answer 8

if you could do such a thing
a) you would be very famous
b) no one's atm cards would be worth the plastic they are made out of

Answer 9

what is known is how the prime numbers are distributed, not how to find them. turns out that for an integer n the number of primes less than n is around\[ \frac{n}{\ln(n)}\]
it has been known since Euclid (300bc) that there are an infinite number of primes

Answer 10

- if we multiple the primes what we know and to this sum we add one we will get prim ?

- like 2x3x5+1=31
- or like 2x3x5x7+1=211

- this is true ?

Answer 11

That is the basis for Euclid's proof ie from a supposedly complete list of primes, you could construct another one (they weren't really into infinity, the Greeks).

Answer 12

- the reality for what i have asked this question is because i have one formula with what i can calculate every primes from 5 till 101 - what i have probed -
- how much is it interesting ?

Answer 13

What would be interesting is discovery of any statements that can be made about primes in general (or even identifiable groups of them).

eg For n>1, there is a prime between n and 2n.

It is generally thought that no formula exists that will produce all the primes.

Answer 14

- ok so from your last words i need understanding that if my formula ,,work" how i have wrote till what i have probed it - is it very very usefuly - important - ?

Answer 15

Unfortunately not, maybe you should take a look at
http://en.wikipedia.org/wiki/Prime_formula

Answer 16

thank you