Newer milestone thread

[Uncwilly]

Originally Posted by petrw1

Once an hour is fine in my opinion

I concur. I believe that I previously expressed this opinion a while back. The 'classic' stats page is done once an hour, right? Doing all of the stats around 5 minutes before the hour (including the work distribution report) would be fine. Only serve up fresh stats on drill downs and specific requests.

[LaurV]

Yaaaarrrrr
Feeling good to be part of a milestone

2014-08-09 First 100 million digit number successfully, and independently, double-checked - M(345,678,877).

[ontopic]
One hour is ok.

[axn]

1. Make it 15 minutes. Not too long, not too often. Just right!
2. Rebuild the cache on schedule, instead of off a page request.
EDIT:-
3. If needed, for the "critical" exponents, add custom code to rebuild the cache instantly when they're checked in

[rudy235]

If things go as expected and the mersenne number with exponent 57861131 is found composite and no new Mersenne Prime magically appears in the next 48 hours...

When was the last time that all mersenne exponents up to the largest mersenne prime –in this particular case M(48)– have been checked once and found composite?

I am guessing that that has not been the case for the last 50 years at least. (yes, I realize that checking once does not make 100% certain that there in not another prime "hidden" somewhere in there.)

Another trivial question.

In 1988 Colquitt & Welsh discovered M(29) exponent 110503 a 5 years after M(30) and 3 years after (M31).

Was this the case of a first LL test that gave composite and no one doing a second LL? Seems a bit odd that 5 years passed (1985-1988) without that exponent being checked again.

[LaurV]

Originally Posted by rudy235

Was this the case of a first LL test that gave composite and no one doing a second LL? Seems a bit odd that 5 years passed (1985-1988) without that exponent being checked again.

In pre-GIMPS era the search was not so systematical and not so coordinated. People "guessed" where primes could lay using whatever method and started testing few exponents around that value. GIMPS stepped in later, in fact it founds the last 13 primes, only. Even during its era, in the beginning the search was not very systematical. There is no known case where a first test was wrong, and a second test found a prime. Unless Madpoo finds a prime for one of the expos I doublechecked, and he stubbornly triple check them, haha, in that case I will be the first idiot in history who missed a prime two times

[rudy235]

Originally Posted by LaurV

In pre-GIMPS era the search was not so systematical and not so coordinated. People "guessed" where primes could lay using whatever method and started testing few exponents around that value. GIMPS stepped in later, in fact it founds the last 13 primes, only. Even during its era, in the beginning the search was not very systematical. There is no known case where a first test was wrong, and a second test found a prime. Unless Madpoo finds a prime for one of the expos I doublechecked, and he stubbornly triple check them, haha, in that case I will be the first idiot in history who missed a prime two times

So.. can we safely say that this will be the first time all the exponents smaller than the current Mersenne Prime Record are verified once and found to be composite?

I can imagine M(31) was the last time something like this has happened before in the late 18th Century. Yes, I realize that it was trial division and not LL tests what was used then to discover M(31)

[Prime95]

Originally Posted by rudy235

When was the last time that all mersenne exponents up to the largest mersenne prime –in this particular case M(48)– have been checked once and found composite?

From the milestones page:

November 14, 2001 Prime M(13466917) is discovered!
2001-09-25 All exponents below 8,000,000 tested at least once.

[ATH]

Originally Posted by rudy235

When was the last time that all mersenne exponents up to the largest mersenne prime –in this particular case M(48)– have been checked once and found composite?

It has happened 3 times before:
2012-09-05 to 2013-01-25 (142 days)
2001-07-25 to 2001-11-14 (112 days)
1998-09-26 to 1999-06-01 (248 days)
Total: 502 days (out of 6898 days since GIMPS first prime)

2013-01-25   Prime M(57885161) discovered!!				14 discovered 13 tested
2012-09-05   All exponents below M(43112609) tested at least once.	13 discovered 13 tested
2012-09-05   All exponents below M(42643801) tested at least once.	13 discovered 12 tested
2010-12-25   All exponents below M(37156667) tested at least once.	13 discovered 11 tested
2010-12-25   All exponents below M(32582657) tested at least once.	13 discovered 10 tested
2010-07-29   All exponents below M(30402457) tested at least once.	13 discovered 9 tested
2009-04-12   Prime M(42643801) discovered!!				13 discovered 8 tested
2009-04-08   All exponents below M(25964951) tested at least once.	12 discovered 8 tested
2009-02-23   All exponents below M(24036583) tested at least once.	12 discovered 7 tested
2008-09-06   Prime M(37156667) discovered!!				12 discovered 6 tested
2008-08-23   Prime M(43112609) discovered!!				11 discovered 6 tested
2008-07-04   All exponents below M(20996011) tested at least once.	10 discovered 6 tested
2006-09-04   Prime M(32582657) discovered!!				10 discovered 5 tested
2005-12-15   Prime M(30402457) discovered!!				9 discovered 5 tested
2005-02-18   Prime M(25964951) discovered!!				8 discovered 5 tested
2004-10-03   All exponents below M(13466917) tested at least once.	7 discovered 5 tested
2004-05-15   Prime M(24036583) discovered!!				7 discovered 4 tested
2003-11-17   Prime M(20996011) discovered!!				6 discovered 4 tested
2001-11-14   Prime M(13466917) discovered!!				5 discovered 4 tested
2001-07-25   All exponents below M(6972593) tested at least once.	4 discovered 4 tested
1999-06-01   Prime M(6972593) discovered!!				4 discovered 3 tested
1998-09-26   All exponents below M(3021377) tested at least once.	3 discovered 3 tested
1998-09-19   All exponents below M(2976221) tested at least once.	3 discovered 2 tested
1998-01-27   Prime M(3021377) discovered!!				3 discovered 1 tested
1997-10-11   All exponents below M(1398269) tested at least once.	2 discovered 1 tested
1997-08-28   All exponents below M(1257787) tested at least once.
1997-08-24   Prime M(2976221) discovered!!				2 discovered 0 tested
1997-03-28   All exponents below M(859433) tested at least once.
1997-01-15   All exponents below M(756839) tested at least once.
1996-11-13   Prime M(1398269) discovered!!				1 discovered 0 tested

[rudy235]

Thanks!

Originally Posted by ATH

It has happened 3 times before:
2012-09-05 to 2013-01-25 (142 days)
2001-07-25 to 2001-11-14 (112 days)
1998-09-26 to 1999-06-01 (248 days)
Total: 502 days (out of 6898 days since GIMPS first prime)

2013-01-25   Prime M(57885161) discovered!!				14 discovered 13 tested
2012-09-05   All exponents below M(43112609) tested at least once.	13 discovered 13 tested
2012-09-05   All exponents below M(42643801) tested at least once.	13 discovered 12 tested
2010-12-25   All exponents below M(37156667) tested at least once.	13 discovered 11 tested
2010-12-25   All exponents below M(32582657) tested at least once.	13 discovered 10 tested
2010-07-29   All exponents below M(30402457) tested at least once.	13 discovered 9 tested
2009-04-12   Prime M(42643801) discovered!!				13 discovered 8 tested
2009-04-08   All exponents below M(25964951) tested at least once.	12 discovered 8 tested
2009-02-23   All exponents below M(24036583) tested at least once.	12 discovered 7 tested
2008-09-06   Prime M(37156667) discovered!!				12 discovered 6 tested
2008-08-23   Prime M(43112609) discovered!!				11 discovered 6 tested
2008-07-04   All exponents below M(20996011) tested at least once.	10 discovered 6 tested
2006-09-04   Prime M(32582657) discovered!!				10 discovered 5 tested
2005-12-15   Prime M(30402457) discovered!!				9 discovered 5 tested
2005-02-18   Prime M(25964951) discovered!!				8 discovered 5 tested
2004-10-03   All exponents below M(13466917) tested at least once.	7 discovered 5 tested
2004-05-15   Prime M(24036583) discovered!!				7 discovered 4 tested
2003-11-17   Prime M(20996011) discovered!!				6 discovered 4 tested
2001-11-14   Prime M(13466917) discovered!!				5 discovered 4 tested
2001-07-25   All exponents below M(6972593) tested at least once.	4 discovered 4 tested
1999-06-01   Prime M(6972593) discovered!!				4 discovered 3 tested
1998-09-26   All exponents below M(3021377) tested at least once.	3 discovered 3 tested
1998-09-19   All exponents below M(2976221) tested at least once.	3 discovered 2 tested
1998-01-27   Prime M(3021377) discovered!!				3 discovered 1 tested
1997-10-11   All exponents below M(1398269) tested at least once.	2 discovered 1 tested
1997-08-28   All exponents below M(1257787) tested at least once.
1997-08-24   Prime M(2976221) discovered!!				2 discovered 0 tested
1997-03-28   All exponents below M(859433) tested at least once.
1997-01-15   All exponents below M(756839) tested at least once.
1996-11-13   Prime M(1398269) discovered!!				1 discovered 0 tested

[ATH]

Originally Posted by rudy235

So.. can we safely say that this will be the first time all the exponents smaller than the current Mersenne Prime Record are verified once and found to be composite?

There is a real possibility a prime can be found during double check. It is not a big chance but much higher than I originally thought.

If you check this thread: http://www.mersenneforum.org/showthread.php?t=20372 Madpoo is finding lots of computers giving mostly bad results and most of the results are proved wrong when people are double/triple/quad checking them.

[Madpoo]

Originally Posted by LaurV

Unless Madpoo finds a prime for one of the expos I doublechecked, and he stubbornly triple check them, haha, in that case I will be the first idiot in history who missed a prime two times

I don't know why you insist on double-checking your own work. LOL As far as I can tell, your machines have been working well, so you're worrying over nothing.