On Saturday 05 April 2003 20:33, Alexander Kruppa wrote:
Bjoern Hoffmann wrote:
Hi,
I wondered if someone already have checked if the last mersenne
numbers +2 are double primes?
like 3+5, 5+7, 9+11, 11+13 or
824 633 702 441
and
824 633 702 443
regards
Bjoern
Mp + 2 is
Hi,
I wondered if someone already have checked if the last mersenne
numbers +2 are double primes?
like 3+5, 5+7, 9+11, 11+13 or
824 633 702 441
and
824 633 702 443
regards
Bjoern
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Bjoern Hoffmann wrote:
Hi,
I wondered if someone already have checked if the last mersenne
numbers +2 are double primes?
like 3+5, 5+7, 9+11, 11+13 or
824 633 702 441
and
824 633 702 443
regards
Bjoern
Mp + 2 is divisible by 3 for odd p and thus cannot be prime.
Mp - 2 however can, in theory,
Hi,
The _only_ incidence of 2^p-1 2^p+1 both being prime is p=2 yielding the
prime pair (3, 5).
Here's a proof by induction:
Consider the difference between the second successor of two consecutive
Mersenne numbers with odd exponents:
(2^(n+2)+1) - (2^n+1) = 2^(n+2) - 2^n = 2^n * (2^2 - 1) =
Frank Anzalone [mailto:[EMAIL PROTECTED] wrote:
9 is Prime?
like 3+5, 5+7, 9+11, 11+13 or
this list was in a german article about the proof of infinite twin
primes by Goldston and Yildirim. The 9 was marked as error of
measurment for
Pn+1 - Pn (log) Pn)^8/9
Hi
Brian J. Beesley wrote:
The _only_ incidence of 2^p-1 2^p+1 both being prime is p=2 yielding the
prime pair (3, 5).
Here's a proof by induction:
*snip*
Another proof: 2^n+1 is prime easily implies n is a power of 2. The only
power of 2 which is prime is 2.
Regards,
Josh Zelinsky
[EMAIL
