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Message boards : Sieving : Sieving algorithm query

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Luke Richards
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Joined: 19 Dec 17
Posts: 3
ID: 961881
Credit: 18,300
RAC: 0
Generalized Cullen/Woodall Sieve (suspended) Bronze: Earned 10,000 credits (15,837)
Message 116326 - Posted: 22 Mar 2018 | 20:20:20 UTC

Hi all,

I'm an amateur mathematician with a big interest in prime numbers - I've been posting a bit on the Mersenne Forum over the past few months. I was wondering what method/algorithm is used on PrimeGrid projects? Is it a simple case of trial factoring each potential prime up to a certain limit or is there anything more sophisticated about it?

Thanks :)

Luke

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JimBProject donor
Honorary cruncher
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Joined: 4 Aug 11
Posts: 916
ID: 107307
Credit: 974,532,191
RAC: 6
Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,726,625)Cullen LLR Turquoise: Earned 5,000,000 credits (5,031,868)ESP LLR Turquoise: Earned 5,000,000 credits (5,064,082)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,038,750)PPS LLR Turquoise: Earned 5,000,000 credits (5,000,461)PSP LLR Turquoise: Earned 5,000,000 credits (7,674,374)SoB LLR Sapphire: Earned 20,000,000 credits (42,604,648)SR5 LLR Jade: Earned 10,000,000 credits (11,829,173)SGS LLR Ruby: Earned 2,000,000 credits (2,413,082)TRP LLR Ruby: Earned 2,000,000 credits (2,291,092)Woodall LLR Turquoise: Earned 5,000,000 credits (5,046,412)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,057,614)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,002,919)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,005,451)PPS Sieve Emerald: Earned 50,000,000 credits (52,042,965)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,341,676)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,070,804)AP 26/27 Jade: Earned 10,000,000 credits (10,742,251)GFN Emerald: Earned 50,000,000 credits (50,000,251)PSA Double Gold: Earned 500,000,000 credits (728,547,693)
Message 116336 - Posted: 23 Mar 2018 | 0:50:21 UTC

The only software someone at PrimeGrid actually writes are the BOINC wrappers for primality and sieving programs that require them. Those wrappers are comparatively simple. As far as the code that actually does the heavy lifting, you might want to look at the Source code repositories thread where we list the locations of all the source code that we know of.

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dukebg
Volunteer tester
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Joined: 21 Nov 17
Posts: 240
ID: 950482
Credit: 23,670,125
RAC: 0
Found 1 prime in the 2018 Tour de Primes321 LLR Gold: Earned 500,000 credits (506,942)Cullen LLR Gold: Earned 500,000 credits (500,523)ESP LLR Gold: Earned 500,000 credits (655,642)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (539,100)PPS LLR Gold: Earned 500,000 credits (688,232)PSP LLR Gold: Earned 500,000 credits (561,629)SoB LLR Ruby: Earned 2,000,000 credits (3,659,676)SR5 LLR Gold: Earned 500,000 credits (505,810)SGS LLR Gold: Earned 500,000 credits (506,024)TRP LLR Gold: Earned 500,000 credits (963,625)Woodall LLR Gold: Earned 500,000 credits (506,044)321 Sieve (suspended) Gold: Earned 500,000 credits (511,694)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (549,916)PPS Sieve Gold: Earned 500,000 credits (701,168)AP 26/27 Gold: Earned 500,000 credits (525,590)WW Gold: Earned 500,000 credits (500,000)GFN Jade: Earned 10,000,000 credits (10,762,872)PSA Gold: Earned 500,000 credits (525,639)
Message 116341 - Posted: 23 Mar 2018 | 6:41:42 UTC - in response to Message 116326.
Last modified: 23 Mar 2018 | 6:41:58 UTC

Hi all,

I'm an amateur mathematician with a big interest in prime numbers - I've been posting a bit on the Mersenne Forum over the past few months. I was wondering what method/algorithm is used on PrimeGrid projects? Is it a simple case of trial factoring each potential prime up to a certain limit or is there anything more sophisticated about it?

Thanks :)

Luke

Also check out
http://primegrid.wikia.com/wiki/Fixed-N_sieve
http://primegrid.wikia.com/wiki/Fixed-K_sieve

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Iain BethuneProject donor
Honorary cruncher
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Joined: 28 Jan 09
Posts: 1588
ID: 34775
Credit: 194,056,043
RAC: 0
321 LLR Gold: Earned 500,000 credits (597,175)Cullen LLR Amethyst: Earned 1,000,000 credits (1,355,381)ESP LLR Turquoise: Earned 5,000,000 credits (5,048,594)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,564,412)PPS LLR Amethyst: Earned 1,000,000 credits (1,025,115)PSP LLR Sapphire: Earned 20,000,000 credits (28,367,849)SoB LLR Jade: Earned 10,000,000 credits (16,215,329)SR5 LLR Turquoise: Earned 5,000,000 credits (5,189,992)SGS LLR Amethyst: Earned 1,000,000 credits (1,244,067)TRP LLR Turquoise: Earned 5,000,000 credits (5,169,405)Woodall LLR Amethyst: Earned 1,000,000 credits (1,070,956)321 Sieve (suspended) Bronze: Earned 10,000 credits (20,003)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (200,371)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (11,645,025)PPS Sieve Turquoise: Earned 5,000,000 credits (7,536,532)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,017,144)TRP Sieve (suspended) Gold: Earned 500,000 credits (554,946)AP 26/27 Ruby: Earned 2,000,000 credits (3,577,848)GFN Emerald: Earned 50,000,000 credits (97,047,976)PSA Ruby: Earned 2,000,000 credits (4,606,694)
Message 116345 - Posted: 23 Mar 2018 | 9:53:39 UTC

Hi Luke,

I wrote an overview paper here which should answer some of your questions, although it's a bit dated now.

- Iain
____________
Twitter: IainBethune
Proud member of team "Aggie The Pew". Go Aggie!
3073428256125*2^1290000-1 is Prime!

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Luke Richards
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Joined: 19 Dec 17
Posts: 3
ID: 961881
Credit: 18,300
RAC: 0
Generalized Cullen/Woodall Sieve (suspended) Bronze: Earned 10,000 credits (15,837)
Message 116348 - Posted: 23 Mar 2018 | 11:46:46 UTC

Thanks all, that's very useful. :)

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Message boards : Sieving : Sieving algorithm query

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