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11) Message boards : Number crunching : From Pi to Paddy Challenge (Message 93198)
Posted 2014 days ago by [DPC]Charley
With just about 19 hours to go, it's time for the usual end of challenge reminder:

At the Conclusion of the Challenge

We would prefer users "moving on" to finish those tasks they have downloaded, if not then please ABORT the WU's instead of DETACHING, RESETTING, or PAUSING.

ABORTING WU's allows them to be recycled immediately; thus a much faster "clean up" to the end of a Challenge. DETACHING, RESETTING, and PAUSING WU's causes them to remain in limbo until they EXPIRE. Therefore, we must wait until WU's expire to send them out to be completed.
12) Message boards : News : From Pi to Paddy Challenge starts March 14th, 03:14:15 UTC (Message 93054)
Posted 2017 days ago by [DPC]Charley
March sees two celebrations, one mostly celebrated by mathematicians the other recognized by a broader part of western society. March 14th is Pi-day, as the approximation starts with 3.14. which could read as March 14th. The other festivity is Saint Patrick's day, which finds its origin in Ireland but is celebrated now in many countries across the world.

To participate in these celebrations, we are hosting a 3 day challenge on the SR5 subproject. Please note the non-standard starting time!

For more information, questions, banter and cursing me for being quite late with information about this challenge please do join us on the forums.
13) Message boards : Number crunching : request: a challenge for rational pi day (Message 93053)
Posted 2017 days ago by [DPC]Charley
hi,
I enjoyed seeing the start times for the challenge that starts on decimal pi day - you've got the decimal approximation of pi in both the time and the North American date format, 3.14.

I wonder if you have noticed that Europeans celebrate rational pi day instead of decimal pi? (*)

I falls of course on 22nd July, which we write as 22/7, following on quickly from right-angle day on the 11th.

So my request to the project is that you add a new challenge to the impressive list you already have, running from 11/7 to 22/7 to make sure that this pi does not turn out half baked. It could last just over 11 days if you start at 03.14 and end at 22:07 on the respective days.

R~~


(*) apologies to any number theorists who are offended by the expression "rational pi" or indeed "decimal pi". These names are, of course, only approximate


Thanks for the input, I hadn't thought of looking at it from that perspective. I'll put it on the suggestions list for next year.
14) Message boards : Number crunching : From Pi to Paddy Challenge (Message 93052)
Posted 2017 days ago by [DPC]Charley
Welcome to the From Pi to Paddy Challenge

March sees two celebrations, one mostly celebrated by mathematicians the other recognized by a broader part of western society. March 14th is Pi-day, as the approximation starts with 3.14. which could read as March 14th. The other festivity is Saint Patrick's day, which finds its origin in Ireland but is celebrated now in many countries across the world.

To participate in these celebrations, we are hosting a 3 day challenge on the SR5 subproject. Please note the non-standard starting time!

This project is an extension of the original Sierpinski/Riesel problems (SoB/TRP). It is attempting to solve the Sierpinski/Riesel problems for base 5 by determining the smallest Sierpinski/Riesel numbers. Therefore, primes of the form k*5^n+/-1 are being sought for even k's.

A distributed effort is currently ongoing in support of the project. More information can be found in the mersenneforum.org Sierpinski/Riesel Base 5 thread.

To participate in the Challenge, please select only the SR5 (LLR) project in your PrimeGrid preferences section. The challenge will begin March 14th 2016, 03:14:15 UTC and end March 17th 2016, 03:14:15 UTC. Application builds are available for Linux , Windows and MacIntel 32 bit and 64 bit. Intel CPU's with AVX and FMA capabilities will be significantly faster than the ones without, as this instruction set allows for more computing power.

ATTENTION: The primality program LLR is CPU intensive; so, it is vital to have a stable system with good cooling. It does not tolerate "even the slightest of errors." Please see this post for more details on how you can "stress test" your computer. WU's will take about 2.5 hours on fast/newer computers and 5+ hours on slower/older computers. If your computer is highly overclocked, please consider "stress testing" it. Sieving is an excellent alternative for computers that are not able to LLR. :)

Restricted airflow is one of the primary reasons for overheating. Take the time to monitor the fans and review the dust buildup. Please, please, please make sure your machines are up to the task.


NOTE: Should you be lucky enough to find a prime, extra processing is required and the run-time may be as much as 10 times longer than normal.

DON'T ABORT TASKS THAT SEEM TO BE TAKING AN UNUSUALLY LONG TIME TO RUN!


Time zone converter

    The World Clock - Time Zone Converter

    NOTE: The countdown clock on the front page uses the host computer time. Therefore, if your computer time is off, so will the countdown clock. For precise timing, use the UTC Time in the data section to the left of the countdown clock.

Scoring Information


    Scores will be kept for individuals and teams. Only work units issued AFTER March 14th 2016, 03:14:15 and received BEFORE March 17th 2016, 03:14:15 UTC will be considered for credit.



    Therefore, each completed WU will earn a unique score based on its n value. The higher the n, the higher the score. This is different than BOINC cobblestones! A quorum of 2 is NOT needed to award Challenge score - i.e. no double checker. Therefore, each returned result will earn a Challenge score. Please note that if the result is eventually declared invalid, the score will be removed.

At the Conclusion of the Challenge


    We would prefer users "moving on" to finish those tasks they have downloaded, if not then please ABORT the WU's instead of DETACHING, RESETTING, or PAUSING.

    ABORTING WU's allows them to be recycled immediately; thus a much faster "clean up" to the end of an LLR Challenge. DETACHING, RESETTING, and PAUSING WU's causes them to remain in limbo until they EXPIRE. Therefore, we must wait until WU's expire to send them out to be completed.

    Please consider either completing what's in the queue or ABORTING them. Thank you. :)


    Best of Luck!!!

    Sierpinski Base 5 - The smallest even Sierpinski base 5 number is suggested to be k=159986. To prove this, it is sufficient to show that k*5^n+1 is prime for each even k < 159986. This has currently been achieved for all even k, with the exception of the following 34 values (as of 13 March 2016):
      k = 6436, 7528, 10918, 26798, 29914, 31712, 36412, 41738, 44348, 44738, 45748, 51208, 58642, 60394, 62698, 64258, 67612, 67748, 71492, 74632, 76724, 81556, 83936, 84284, 90056, 92158, 92906, 93484, 105464, 118568, 126134, 138514, 139196, 152588

    Riesel Base 5 -
    The smallest even Riesel base 5 number is suggested to be k=346802. To prove this, it is sufficient to show that k*5^n-1 is prime for each even k < 346802. This has currently been achieved for all even k, with the exception of the following 77 values (as of 13 March 2016):

      k = 3622, 4906, 23906, 26222, 35248, 35816, 52922, 53546, 63838, 64598, 66916, 68132, 71146, 76354, 81134, 88444, 92936, 102818, 102952, 109238, 109838, 109862, 127174, 131848, 134266, 136804, 143632, 145462, 145484, 146264, 146756, 147844, 151042, 152428, 154844, 159388, 164852, 170386, 170908, 171362, 177742, 180062, 182398, 187916, 189766, 190334, 194368, 195872, 201778, 204394, 206894, 207494, 213988, 231674, 238694, 239062, 239342, 246238, 248546, 259072, 265702, 267298, 271162, 273662, 285598, 285728, 296024, 298442, 301562, 304004, 313126, 318278, 322498, 325922, 327926, 335414, 338866

    History
    Robert Smith originally presented the idea of a Sierpinski/Riesel base 5 search on 17 September 2004, in the primeform yahoo group. Using {3,7,13,31,601} as the covering set, he proposed that k=346802 is the smallest Riesel base 5 number. Shortly afterwards, Guido Smetrijns proposed that k=159986 is the smallest Sierpinski base 5 number.

    After doing most of the initial work himself, Robert posted in the mersenneforum.org on 28 September 2004, and thus, the distributed effort began. Other principle players in the development, management, and growth of the project are Lars Dausch, Geoff Reynolds, Anand S Nair, and Thomas Masser.


Primes found by PrimeGrid
77072*5^2139921+1 found by flex on 6 March 2016 | Official Announcement pending
306398*5^2112410-1 found by NocFlame on 11 January 2016 | Official Announcement
154222*5^2091432+1 found by Scott Brown on 10 November 2015 | Official Announcement
100186*5^2079747-1 found by Toshitaka Kumagai on 21 October 2015 | Official Announcement
144052*5^2018290+1 found by Artist on 23 May 2015 | Official Announcement
109208*5^1816285+1 found by Scott Brown on 18 October 2014 | Official Announcement
325918*5^1803339-1 found by Jörg Meili on 21 September 2014 | Official Announcement
133778*5^1785689+1 found by Guo Hua Miao on 17 August 2014 | Official Announcement
24032*5^1768249+1 found by Hiroyuki Okazaki on 23 July 2014 | Official Announcement
138172*5^1714207-1 found by Walter Darimont on 27 June 2014 | Official Announcement
22478*5^1675150-1 found by Guo Hua Miao on 19 June 2014 | Official Announcement
326834*5^1634978-1 found by Scott Brown on 25 April 2014 | Official Announcement
207394*5^1612573-1 found by Honza Cholt on 9 April 2014 | Official Announcement
104944*5^1610735-1 found by Brian Smith on 9 April 2014 | Official Announcement
330286*5^1584399-1 found by Scott Brown on 21 March 2014 | Official Announcement
22934*5^1536762-1 found by Keishi Toda on 6 February 2014 | Official Announcement
178658*5^1525224-1 found by Keishi Toda on 31 January 2014 | Official Announcement
59912*5^1500861+1 found by Raymond Ottusch on 17 January 2014 | Official Announcement
37292*5^1487989+1 found by Stephen R Cilliers on 29 December 2013 | Official Announcement
173198*5^1457792-1 found by Motohiro Ohno on 4 December 2013 | Official Announcement
245114*5^1424104-1 found by David Yost on 1 November 2013
175124*5^1422646-1 found by David Yost on 31 October 2013
256612*5^1335485-1 found by Wolfgang Schwieger on 4 August 2013
268514*5^1292240-1 found by Raymond Schouten on 16 July 2013
243944*5^1258576-1 found by Tod Slakans on 5 July 2013
97366*5^1259955-1 found by Jörg Meili on 4 July 2013
84466*5^1215373-1 found by Raymond Schouten on 29 June 2013
150344*5^1205508-1 found by Randy Ready on 28 June 2013
1396*5^1146713-1 found by Randy Ready on 23 June 2013
17152*5^1131205-1 found by Bob Benson on 22 June 2013
92182*5^1135262+1 found by Randy Ready on 21 June 2013
329584*5^1122935-1 found by Stephen R Cilliers on 21 June 2013
305716*5^1093095-1 found by Randy Ready on 18 June 2013
130484*5^1080012-1 found by Randy Ready on 17 June 2013
97768*5^987383-1 found by Ulrich Hartel on 17 June 2013
55154*5^1063213+1 found by Senji Yamashita on 16 June 2013
243686*5^1036954-1 found by Katsumi Hirai on 16 June 2013
70082*5^936972-1 found by Scott Brown on 30 May 2013
102976*5^929801-1 found by David Yost on 9 May 2013
110488*5^917100+1 found by Ronny Willig on 25 March 2013
162434*5^856004-1 found by Predrag Kurtovic on 10 January 2013
174344*5^855138-1 found by Ronny Willig on 9 January 2013
57406*5^844253-1 found by David Yost on 7 November 2012
48764*5^831946-1 found by David Yost on 12 October 2012
162668*5^785748-1 found by Lennart Vogel on 3 July 2012
289184*5^770116-1 found by David Yost on 7 June 2012
11812*5^769343-1 found by Göran Schmidt on 2 June 2012
316594*5^766005-1 found by Michael Becker on 30 May 2012
340168*5^753789-1 found by Kimmo Myllyvirta on 18 May 2012
338948*5^743996-1 found by Ricky L Hubbard on 7 May 2012
18656*5^735326-1 found by Lennart Vogel on 3 May 2012
5374*5^723697-1 found by Kelvin Lewis on 13 April 2012
72532*5^708453-1 found by Göran Schmidt on 7 February 2012
2488*5^679769-1 found by Sascha Beat Dinkel on 24 November 2011
331882*5^674961-1 found by Ronny Willig on 11 November 2011
27994*5^645221-1 found by Philipp Bliedung on 18 July 2011
262172*5^643342-1 found by Kimmo Myllyvirta on 13 July 2011
49568*5^640900-1 found by Sascha Beat Dinkel on 1 July 2011
270748*5^614625-1 found by Puzzle Peter on 14 February 2011
266206*5^608649-1 found by Puzzle Peter on 10 February 2011
210092*5^618136-1 found by Puzzle Peter on 31 January 2011
301016*5^586858-1 found by Puzzle Peter on 24 January 2011

Primes found by SR5 since collaboration

109988*5^544269+1 found by ltd on 23 April 2011
68492*5^542553+1 found by ltd on 24 April 2011

Primes found by others

114986*5^1052966-1 found by Sergey Batalov on 3 June 2013
119878*5^1019645-1 found by Sergey Batalov on 3 June 2013

15) Message boards : Number crunching : Tour de Primes 2016 (Message 91924)
Posted 2053 days ago by [DPC]Charley
It'll be the largest until my PPS-Mega prime comes through! (He said confidently, disregarding statistics)
16) Message boards : Generalized Fermat Prime Search : New 2016 world-record prime (Message 91522)
Posted 2065 days ago by [DPC]Charley
Well, I've put my GPU-boots on GFN-22 sieving, rather than on a candy bar.
17) Message boards : Number crunching : Makar Sankranti Challenge (Message 91223)
Posted 2075 days ago by [DPC]Charley
With just about 11 hours to go, it's time for the usual end of challenge reminder:

At the Conclusion of the Challenge

We would prefer users "moving on" to finish those tasks they have downloaded, if not then please ABORT the WU's instead of DETACHING, RESETTING, or PAUSING.

ABORTING WU's allows them to be recycled immediately; thus a much faster "clean up" to the end of a Challenge. DETACHING, RESETTING, and PAUSING WU's causes them to remain in limbo until they EXPIRE. Therefore, we must wait until WU's expire to send them out to be completed.
18) Message boards : Number crunching : Makar Sankranti Challenge (Message 91209)
Posted 2076 days ago by [DPC]Charley
Are you implying that with a paradigm shift in the challenge perspective to be the sub project(s) NOT to run would result in an overall greater number of prime finds :-)

... wait ... does that lead to the extension that if I don't run any projects I win all the primes????
(says the noob as he ducks behind the couch)


Perhaps the best way to find primes during a challenge is to crunch any project that's not in the challenge! (And, to boost your chances, do so when Scott Brown is away on vacation.)

Note to Charley: In 2017, maybe we should coordinate the challenge schedule so that all challenges occur while Scott is away from home.


Maybe we can start a kickstarter or something to try and get Scott as much away from home as possible?
19) Message boards : Number crunching : Winter Solstice Challenge 2015 (Message 91115)
Posted 2079 days ago by [DPC]Charley
No updates the last couple of days, does that mean this has been finalized? If so, fast cleanup (approximately 2 weeks).


Yes.

@Charley -
1. Any chance of getting the Winter Solstice Challenge rolled into the 2015 year-end tables?
2. (Most importantly) Thank you for all your time and efforts - they are greatly appreciated!!!


1. The chance of that is 1.
2. More than welcome.
20) Message boards : Number crunching : Makar Sankranti Challenge (Message 90856)
Posted 2087 days ago by [DPC]Charley
The results of the test on the configuration:
CPU: Intel Core i5-4690K @ 4,6GHz
Graphic Cards: Inno3D iChill GeForce GTX 770 HerculeZ X3 Ultra 2 GB (1150 / 1254Boost / 7200)
Tasks: GFN15

Only CPU: 4 tasks on 810 seconds.
Only GPU: 1 task 142 seconds.
CPU + GPU: CPU task 4 from 816 to 1100 seconds; GPU on one task spends 160-190 seconds.


Please note that these are not part of the challenge.


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