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Forum: Information & Answers

2013-02-05, 21:20

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

Hi Aketilander, Double mersenne number...

Hi Aketilander,

Double mersenne number is only 2 levels of POWER of 2.
I am thinking for more than 2 (may be infinite levels) , it is always a prime number
MMp : Double mersenne...

Forum: Information & Answers

2013-02-05, 21:11

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

Sorry , My question may be misunderstood for...

Sorry , My question may be misunderstood for someone , my question in tcl scripting clearly is

set x 3
while { $x > 0} {
...

Forum: Information & Answers

2013-02-05, 21:06

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

Yes, Aketilander ,Thanks...

Yes, Aketilander ,Thanks...

Forum: Information & Answers

2013-02-05, 21:03

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

if it is a primenumber , can we conclude that 2...

if it is a primenumber , can we conclude that 2 POWER (mersenne prime number) is always a prime number, so then we can easily figure out the next largest primenumbers .

Forum: Information & Answers

2013-02-05, 20:58

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

Hi , POWER(2,2)-1 is primenumber (3) ...

Hi ,
POWER(2,2)-1 is primenumber (3)
POWER(2,3)-1 is a primenumber (7)
POWER(2,7)-1 is a primenumber (127)
POWER(2,127)-1 is also a primenumber ( 170141183…884105727 )

so this...

Forum: Information & Answers

2013-02-05, 20:46

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

Ok, Thanks what about this . 2 ^ 2 ^127...

Ok, Thanks what about this .

2 ^ 2 ^127 -1 which is more clearly POWER(2,(POWER(2,127)) -1

Forum: Information & Answers

2013-02-05, 20:36

Replies: 40

2^primenumber -1 is always a prime number ?

Views: 3,887

Posted By Mastan

2^primenumber -1 is always a prime number ?

Hi All,

Please let me know was if 2^8191 -1 proved to be not prime number ?
Since I saw the symmetry till the number ( 2^127-1 ) that 2 power of any primenumber is a primenumber too.

...

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