Re: Research prime's number
- From: "David L. Wilson" <dwilson314@xxxxxxxxxxx>
- Date: Sun, 6 May 2007 09:49:18 -0400
"jinhyun" <jinhyunshyam@xxxxxxxxx> wrote in message
news:1178456769.471449.149990@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 6, 1:12 pm, Vincenzo Librandi <vincenzo.librandw...@xxxxxxxx>
wrote:
Is (n) the odd numbers.
If the couple it's made up of two numbers
addition =(n) to no admit common's divisor,
then(n) is prime number.
example:
(n) = 23
The couple (2,21), (3,20), (4,19), (5,18),
(6,17), (7,16),(8,15), (9,14), (10,13), (11,12);
no admit common's divisor then (n)=23 is prime number.
(n) = 15
The couple (2,13),(3,12),(4,11),(5,10),(6,9),(7,8);
admit (3,12),(6,9) divisor 3; and (5,10) divisor 5.
Then 15 = 3*5
Who explain it ?
Good bye
Vincenzo Librandi
vincenzo.librandw...@xxxxxxxx
Is 4+5 prime?
You miss understood his badly made claim if I understand it correctly from
his examples. I think he is trying to say that n is prime iff when written
as a sum of 2 positive integers then there is never a pair with a common
divisor. He already knew 9 was not prime by his claim as 9=3+6 and they
have a common divisor of 3. Of course his claim is easily seen to be true
and not of any real value. (n is not prime iff n=jk where jk and integers
1. Write n as j(k-1) + j and j is a common divisor of j(k-1) and j. If isprime, one cannot write it as the sum of two numbers with a common divisor
(>1) or it would not be prime: n=ac+bc=c(a+b) and hence not prime.
.
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- From: Vincenzo Librandi
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