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Message boards : Number crunching : International Day of Education Challenge

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Profile Michael GutierrezProject donor
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Joined: 21 Mar 17
Posts: 13
ID: 764476
Credit: 25,876,019
RAC: 95,172
Found 1 prime in the 2019 Tour de PrimesESP LLR Silver: Earned 100,000 credits (398,507)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (604,364)PPS LLR Jade: Earned 10,000,000 credits (15,171,082)PSP LLR Amethyst: Earned 1,000,000 credits (1,042,842)SoB LLR Ruby: Earned 2,000,000 credits (2,363,005)SGS LLR Gold: Earned 500,000 credits (525,143)Woodall LLR Amethyst: Earned 1,000,000 credits (1,085,552)321 Sieve Amethyst: Earned 1,000,000 credits (1,089,864)Generalized Cullen/Woodall Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,085,904)AP 26/27 Silver: Earned 100,000 credits (101,075)GFN Ruby: Earned 2,000,000 credits (2,300,998)PSA Silver: Earned 100,000 credits (108,393)
Message 136459 - Posted: 20 Jan 2020 | 16:20:13 UTC
Last modified: 20 Jan 2020 | 20:42:10 UTC

Welcome to the International Day of Education Challenge

Education is a human right, a public good and a public responsibility.

The United Nations General Assembly proclaimed 24 January as International Day of Education, in celebration of the role of education for peace and development.

Without inclusive and equitable quality education and lifelong opportunities for all, countries will not succeed in achieving gender equality and breaking the cycle of poverty that is leaving millions of children, youth and adults behind.

Today, 258 million children and youth still do not attend school; 617 million children and adolescents cannot read and do basic math; less than 40% of girls in sub-Saharan Africa complete lower secondary school and some four million children and youth refugees are out of school. Their right to education is being violated and it is unacceptable.

Because, now more than ever, we need to mobilize, UNESCO, on the occasion of the International Day of Education, is issuing a call for action - action for education. High-level political authorities and citizens, States and associations, teachers and parents of students: everyone, in their own way, has a role to play in making the right to education a reality for all. It is our responsibility to future generations.

— Audrey Azoulay, Director General, Message on the occasion of the International Day of Education

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In observance of UNESCO's International Day of Education, PrimeGrid will be running a 1-day challenge on 321-sieve. The Challenge will be on January 24th from 00:00:00 UTC until 23:59:59 UTC.

To participate in the Challenge, please select only the 321-Sieve subproject in your PrimeGrid preferences section.

Application builds are available for the following:


  • Microsoft Windows (98 or later) running on an Intel x86-compatible CPU
  • Microsoft Windows running on an AMD x86_64 or Intel EM64T CPU
  • Linux running on an Intel x86-compatible CPU
  • Linux running on an AMD x86_64 or Intel EM64T CPU
  • Mac OS 10.5+ running on an Intel 64-bit CPU



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 above the countdown clock.



Scoring information


    Scores will be kept for individuals and teams. Only work units issued AFTER January 24th 00:00 UTC and received BEFORE January 25th 00:00 UTC will be considered for credit. We will be using the same scoring method as we currently use for BOINC credits.
    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 kindly ask users "moving on" to ABORT their WU's instead of DETACHING, RESETTING, or PAUSING.

    ABORTING WU's alows 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.

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



About 321 Search

321 Search began in February 2003 from a post by Paul Underwood seeking help from interested parties in a prime search attempt of the form 3*2^n-1. The initial goal was to build upon the completed work at Proth Search and extend the list of known primes to an exponent of 1 million (n=1M). That was quickly achieved so they advanced their goal to finding a mega prime for which they sieved up to n=5M.

As seen on PrimeGrid's front page, that goal was achieved on 23 Mar 2008, 7:57:28 UTC, when Dylan Bennett of Canada returned a positive result for n=4235414 (3*2^4235414-1). official announcement | decimal representation

PrimeGrid added the +1 form and continues the search up to n=50M.

Primes known for 3*2^n+1 occur at the following n (PrimeGrid's finds in bold & linked):
1, 2, 5, 6, 8, 12, 18, 30, 36, 41, 66, 189, 201, 209, 276, 353, 408, 438, 534, 2208, 2816, 3168, 3189, 3912, 20909, 34350, 42294, 42665, 44685, 48150, 54792, 55182, 59973, 80190, 157169, 213321, 303093, 362765, 382449, 709968, 801978, 916773, 1832496, 2145353, 2291610, 2478785, 5082306, 7033641, 10829346

Primes known for 3*2^n-1 occur at the following n (PrimeGrid's finds in bold & linked):
1, 2, 3, 4, 6, 7, 11, 18, 34, 38, 43, 55, 64, 76, 94, 103, 143, 206, 216, 306, 324, 391, 458, 470, 827, 1274, 3276, 4204, 5134, 7559, 12676, 14898, 18123, 18819, 25690, 26459, 41628, 51387, 71783, 80330, 85687, 88171, 97063, 123630, 155930, 164987, 234760, 414840, 584995, 702038, 727699, 992700, 1201046, 1232255, 2312734, 3136255, 4235414, 6090515, 11484018, 11731850, 11895718


What is sieving?

Sieving is the first step to prime finding. In general, a sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods. The word "sift" derives from this term. (Wikipedia - Sieve)

In PrimeGrid's case, the desired elements ultimately are prime numbers and the unwanted material are composite numbers. Our tool of choice for 321 sieve is Geoffrey Reynolds' sr2sieve program. It eliminates possible candidates by removing numbers that have small factors. As this process is much faster than primality testing, it is good to thoroughly sieve a data set before primality testing.

Sieving removes many candidates at the beginning. However, the deeper the sieve goes, the slower the rate of removal, till eventually sieving removes candidates at the same rate as primality testing. This is sometimes referred to as "optimal depth". Primality testing is recommended at this point.

There are many factors that determine how much time and how deep to sieve. After sieving, all the remaining candidates must be primality tested to determine their "prime" status.


Best of Luck to everyone!

Profile JeppeSNProject donor
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Joined: 5 Apr 14
Posts: 986
ID: 306875
Credit: 11,561,479
RAC: 410
321 LLR Silver: Earned 100,000 credits (360,928)Cullen LLR Bronze: Earned 10,000 credits (98,851)ESP LLR Silver: Earned 100,000 credits (139,922)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (35,236)PPS LLR Ruby: Earned 2,000,000 credits (2,530,302)PSP LLR Silver: Earned 100,000 credits (212,242)SoB LLR Silver: Earned 100,000 credits (237,390)SR5 LLR Bronze: Earned 10,000 credits (16,010)SGS LLR Bronze: Earned 10,000 credits (32,969)TRP LLR Bronze: Earned 10,000 credits (71,060)Woodall LLR Silver: Earned 100,000 credits (109,455)321 Sieve Silver: Earned 100,000 credits (101,851)PSA Turquoise: Earned 5,000,000 credits (7,614,290)
Message 136470 - Posted: 21 Jan 2020 | 8:09:46 UTC

Instructions:



/JeppeSN

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 13100
ID: 53948
Credit: 208,147,708
RAC: 100,282
The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (10,446,646)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,221,148)SR5 LLR Turquoise: Earned 5,000,000 credits (8,894,490)SGS LLR Ruby: Earned 2,000,000 credits (2,014,138)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (6,547,039)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,114,260)GFN Emerald: Earned 50,000,000 credits (68,965,421)PSA Jade: Earned 10,000,000 credits (12,404,447)
Message 136476 - Posted: 21 Jan 2020 | 11:24:54 UTC - in response to Message 136470.

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Message boards : Number crunching : International Day of Education Challenge

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