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2020-01-20, 07:33
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#1915 | |
Jun 2015
Vallejo, CA/.
3×383 Posts |
Quote:
Last year (2019) we had to wait 60 days more to get a prime over 2 million digits. |
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2020-01-20, 20:52
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#1916 | |
Dec 2011
After milion nines:)
23×7×29 Posts |
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2020-02-02, 01:07
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#1917 |
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Random Account
Aug 2009
Not U. + S.A.
2×31×41 Posts |
1901*2^195870-1 is prime! (58967 decimal digits)
It is not much but it is a start, once I determined how to use NewPGen. |
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2020-02-02, 07:10
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#1918 | |
"Curtis"
Feb 2005
Riverside, CA
130138 Posts |
Quote:
Also, newpgen is very very slow for this form of prime. The srsieve family of programs is an order of magnitude or so faster; srsieve to create the sieve initially, then sr1sieve to sieve a single "k" of k*2^n-1. If you're interested in multiple k's, sr2sieve is your hero. sr1sieve speaks the same format as newpgen, so you can also use newpgen to create a sieve file, and then use sr1sieve to find factors. I forget if it's 10x or 20x faster, but it's really really fast. Command line, though- all the good stuff is, around here. Have a look at https://www.rieselprime.de/default.htm to see what primes are known for individual k's. For 1901, that's 2, 62, 66, 210, 290, 602, 726, 938, 998, 21342, 195870, 239030, 335018. Last fiddled with by VBCurtis on 2020-02-02 at 07:17 Reason: added prime list reference |
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2020-02-02, 14:38
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#1919 | ||
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Random Account
Aug 2009
Not U. + S.A.
2·31·41 Posts |
Quote:
Quote:
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2020-02-06, 02:47
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#1920 |
Sep 2002
Database er0rr
24·281 Posts |
69*2^6639971-1 is prime! (1998833 decimal digits) Time : 2777.921 sec.
This prime has taken many years for Vincent and me to find, but, oh boy, is it worth it!  
Last fiddled with by paulunderwood on 2020-02-06 at 07:29 |
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2020-02-06, 08:02
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#1921 | |
Sep 2006
The Netherlands
2×13×31 Posts |
Quote:
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2020-02-06, 09:04
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#1922 |
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
7×733 Posts |
Congrats to both, well deserved.
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2020-02-06, 09:45
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#1923 |
Feb 2003
27×3×5 Posts |
Congratulations!
 So close to 2 million decimal digits... |
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2020-02-06, 09:54
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#1924 |
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Sep 2006
The Netherlands
11001001102 Posts |
If there is 1+ closeby we'll have it soon as well.
69 seems very unpredictable now because of the huge gap, yet odds are they group a little together. |
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2020-02-06, 11:50
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#1925 | |
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Dec 2011
After milion nines:)
23×7×29 Posts |
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