Need software for calculating primes

[mesa]

Does anyone have software I can run on my PC that can calculate primes to 8.0 x 10²⁰?

 

[phinds]

try Planet Source Code

 

[mesa]

try Planet Source Code

How do I register for the login?

****EDIT****Never mind, I just checked their facebook page and apparently the site is down due to a power outage until tomorrow.

Does anyone else have a source for checking primes to 8.0x10²⁰?

 

[mesa]

try Planet Source Code

Planet Source Code is back online although it appears to be a site for people that know how to program which I do not (I am old school over here). Thanks for the attempt.

Does anyone else have anything?

 

[phyzguy]

Mathematica, or Wolfram alpha (http://www.wolframalpha.com) will calculate primes, but I doubt that they will go up to 8E20 in any reasonable time. It can calculate primes up to ~1E12 in a few seconds, but if I'm not mistaken calculating primes is approximately an O(N) algorithm, so it will take years to go up to ~1E20. What are you trying to do? Calculate all of the primes up to 8E20? Where would you store them?

 

[mesa]

Mathematica, or Wolfram alpha (http://www.wolframalpha.com) will calculate primes, but I doubt that they will go up to 8E20 in any reasonable time. It can calculate primes up to ~1E12 in a few seconds, but if I'm not mistaken calculating primes is approximately an O(N) algorithm, so it will take years to go up to ~1E20. What are you trying to do? Calculate all of the primes up to 8E20? Where would you store them?

Luckily I didn't need all the primes just something that can verify them up to that value but preferably much higher. I found this site,

http://www.alpertron.com.ar/ECM.HTM

So far it has been able to verify the primes I generated up to

125,024,575,647,509,552,016,558,656,041 and 125,024,575,647,509,552,016,558,656,167

Not bad at all. Unfortunately my calculator/pen and paper method do not allow me to go any further. Guess that will need upgraded next.

***EDIT*** found a better calculator.

New personal record for generating primes using calculator/pen and paper method is now at,

52,098,944,879,727,879,738,571,834,212,718,601,969,472,403,507,608,638,174,209,127

and,

52,098,944,879,727,879,738,571,834,212,718,601,969,472,403,507,608,638,174,208,761

and there you have it. Sorry for over-posting but these primes are a lot of fun!

****EDIT**** Calculator/pen and paper method,

Okay, one more time,

3,791,737,052,794,739,934,469,477,610,338,330,426,610,616,534,498,673,313,167,532,771,648,137,234,488,985,048,534,111,985,849,083,656,689

and,

3,791,737,052,794,739,934,469,477,610,338,330,426,610,616,534,498,673,313,167,532,771,648,137,234,488,985,048,534,111,985,849,083,657,093

Those primes are both well over a googel! Woo Hoo!

Not bad for pen, paper and calculator :)