20060613, 21:24  #23 
Nov 2004
California
2^{3}·3·71 Posts 
268964355*2^1950001 is prime! Time : 90.980 sec.
269367765*2^1950001 is prime! Time : 100.803 sec. 
20060614, 02:59  #24 
Jun 2003
3^{2}·5^{2}·7 Posts 
196134045*2^195000+1 is prime!
My first prime for this project. Too bad it does not go into to Top 5000. 
20060614, 06:33  #25 
Oct 2005
Fribourg, Switzerlan
FC_{16} Posts 
Do you mean 196134045*2^1950001 is prime too???

20060614, 07:49  #26 
Jun 2003
3^{2}·5^{2}·7 Posts 
No the 1 is not prime

20060614, 13:55  #27 
Oct 2005
Fribourg, Switzerlan
2^{2}·3^{2}·7 Posts 
Ok :)
And why do you check for +1 first? 
20060614, 14:45  #28 
Oct 2005
Italy
523_{8} Posts 
What is the actual ratio PRIMES / MILLIONS TESTED ?

20060614, 15:52  #29  
Jun 2003
627_{16} Posts 
Quote:


20060614, 16:07  #30  
Oct 2005
Fribourg, Switzerlan
11111100_{2} Posts 
Quote:


20060614, 16:54  #31 
Jun 2003
3^{2}·5^{2}·7 Posts 
I have an LLRnet server set up for +1 numbers, so I prefer working on +1 numbers. If I wanted to do 1 search, I will have to modify all my computers, which will be a hassle. Hence, I tested +1 primes.

20060615, 07:10  #32 
Oct 2005
Italy
3×113 Posts 
Ok I computed actual ratio: it should be 47 primes on 255 Millions tested, that is
0.184313 It means we are finding a prime every 5.42 Millions. We are slightly under previsions (between 0.2 and 0.25) . 
20060615, 09:43  #33 
Mar 2004
3×127 Posts 
Where The number of twins remains constant (After sieving to 83T, a range of 24.7G and 10005865 Candidates it is one twin every 13.77G), the average Gap between Primes is increasing proportiona to the ratio of the log(sieving limit).
That means sieving to 45 bit instead if 44 bit means a 45/44 larger gap between the primes. (Reason: The sieve is biased to finding twins) The current value at 83T is a prime every 5.83M. 
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