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Message boards : News : The Cinco de Mayo Challenge. May 5 18:00 UTC

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Profile Lennart SM5YMTProject donor
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Joined: 7 May 07
Posts: 1125
ID: 7989
Credit: 694,692,344
RAC: 0
Tour de Primes 2009Tour de Primes 2009Tour de Primes 2010Tour de Primes 2010321 LLR Turquoise: Earned 5,000,000 credits (5,097,586)Cullen LLR Amethyst: Earned 1,000,000 credits (1,101,661)PPS LLR Emerald: Earned 50,000,000 credits (80,169,933)PSP LLR Jade: Earned 10,000,000 credits (18,921,475)SoB LLR Bronze: Earned 10,000 credits (55,453)SR5 LLR Ruby: Earned 2,000,000 credits (4,407,637)SGS LLR Ruby: Earned 2,000,000 credits (4,595,742)TPS LLR (retired) Silver: Earned 100,000 credits (360,998)TRP LLR Turquoise: Earned 5,000,000 credits (5,800,792)Woodall LLR Ruby: Earned 2,000,000 credits (4,885,194)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,345,944)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,566,122)PPS Sieve Double Silver: Earned 200,000,000 credits (220,787,724)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,694,194)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,986,371)AP 26/27 Amethyst: Earned 1,000,000 credits (1,780,026)GFN Jade: Earned 10,000,000 credits (18,585,003)PSA Double Silver: Earned 200,000,000 credits (287,482,568)
Message 53714 - Posted: 2 May 2012 | 19:14:19 UTC
Last modified: 2 May 2012 | 22:07:26 UTC

Come join us for the 5th day of the 5th month celebration. A 5 day Challenge is being offered on PrimeGrid's "The Riesel Problem" (LLR) application¦ends on the 10th. There remains 56 k's in The Riesel Problem for which no primes have been found.

For more information, please see this forum post.

Profile rebirther
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Joined: 10 Aug 05
Posts: 778
ID: 85
Credit: 175,774,608
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321 LLR Silver: Earned 100,000 credits (186,594)Cullen LLR Silver: Earned 100,000 credits (106,665)ESP LLR Gold: Earned 500,000 credits (502,416)PPS LLR Gold: Earned 500,000 credits (504,111)PSP LLR Gold: Earned 500,000 credits (513,785)SoB LLR Gold: Earned 500,000 credits (564,944)SR5 LLR Ruby: Earned 2,000,000 credits (2,790,118)SGS LLR Gold: Earned 500,000 credits (501,099)TPS LLR (retired) Bronze: Earned 10,000 credits (46,235)TRP LLR Gold: Earned 500,000 credits (708,706)Woodall LLR Silver: Earned 100,000 credits (133,626)321 Sieve (suspended) Bronze: Earned 10,000 credits (21,527)Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (14,729,132)PPS Sieve Double Bronze: Earned 100,000,000 credits (132,786,707)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Gold: Earned 500,000 credits (510,317)TRP Sieve (suspended) Gold: Earned 500,000 credits (620,991)AP 26/27 Silver: Earned 100,000 credits (418,876)GFN Amethyst: Earned 1,000,000 credits (1,795,613)PSA Jade: Earned 10,000,000 credits (18,329,123)
Message 53715 - Posted: 2 May 2012 | 19:20:27 UTC - in response to Message 53714.

I thought 56k's left???

Profile Lennart SM5YMTProject donor
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Joined: 7 May 07
Posts: 1125
ID: 7989
Credit: 694,692,344
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Tour de Primes 2009Tour de Primes 2009Tour de Primes 2010Tour de Primes 2010321 LLR Turquoise: Earned 5,000,000 credits (5,097,586)Cullen LLR Amethyst: Earned 1,000,000 credits (1,101,661)PPS LLR Emerald: Earned 50,000,000 credits (80,169,933)PSP LLR Jade: Earned 10,000,000 credits (18,921,475)SoB LLR Bronze: Earned 10,000 credits (55,453)SR5 LLR Ruby: Earned 2,000,000 credits (4,407,637)SGS LLR Ruby: Earned 2,000,000 credits (4,595,742)TPS LLR (retired) Silver: Earned 100,000 credits (360,998)TRP LLR Turquoise: Earned 5,000,000 credits (5,800,792)Woodall LLR Ruby: Earned 2,000,000 credits (4,885,194)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,345,944)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,566,122)PPS Sieve Double Silver: Earned 200,000,000 credits (220,787,724)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,694,194)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,986,371)AP 26/27 Amethyst: Earned 1,000,000 credits (1,780,026)GFN Jade: Earned 10,000,000 credits (18,585,003)PSA Double Silver: Earned 200,000,000 credits (287,482,568)
Message 53723 - Posted: 2 May 2012 | 21:10:49 UTC - in response to Message 53715.

I thought 56k's left???


Sorry I missed that :)

Lennart

Profile j.sheridanProject donor
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Posts: 437
ID: 91622
Credit: 679,433,675
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321 LLR Ruby: Earned 2,000,000 credits (3,002,360)Cullen LLR Ruby: Earned 2,000,000 credits (3,040,127)PPS LLR Ruby: Earned 2,000,000 credits (4,146,102)PSP LLR Turquoise: Earned 5,000,000 credits (5,432,836)SoB LLR Turquoise: Earned 5,000,000 credits (5,623,361)SR5 LLR Gold: Earned 500,000 credits (640,957)SGS LLR Ruby: Earned 2,000,000 credits (4,053,556)TRP LLR Ruby: Earned 2,000,000 credits (3,826,598)Woodall LLR Ruby: Earned 2,000,000 credits (3,123,627)321 Sieve (suspended) Silver: Earned 100,000 credits (237,768)Cullen/Woodall Sieve (suspended) Double Silver: Earned 200,000,000 credits (265,102,350)PPS Sieve Double Silver: Earned 200,000,000 credits (292,642,933)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,801,812)GFN Emerald: Earned 50,000,000 credits (82,759,285)
Message 53729 - Posted: 2 May 2012 | 21:39:13 UTC - in response to Message 53714.

ends on the 13th.

don't think so.

Also the home page has a link for the "Cinco de Maoy Challenge".

Qiao
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Joined: 21 Apr 12
Posts: 2
ID: 139049
Credit: 405,110
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PPS Sieve Silver: Earned 100,000 credits (384,294)
Message 54225 - Posted: 9 May 2012 | 12:11:43 UTC

primegrid计算的不是素数么?那为什么需要大量的浮点运算。那位能给我讲解下。谢谢。

Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 9637
ID: 53948
Credit: 107,021,488
RAC: 100,418
321 LLR Amethyst: Earned 1,000,000 credits (1,169,719)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Amethyst: Earned 1,000,000 credits (1,179,211)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,330,821)PPS LLR Amethyst: Earned 1,000,000 credits (1,254,873)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Ruby: Earned 2,000,000 credits (2,109,825)SR5 LLR Turquoise: Earned 5,000,000 credits (6,048,315)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Amethyst: Earned 1,000,000 credits (1,183,026)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Jade: Earned 10,000,000 credits (18,175,834)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 Turquoise: Earned 5,000,000 credits (5,881,239)GFN Sapphire: Earned 20,000,000 credits (42,501,524)PSA Jade: Earned 10,000,000 credits (10,028,791)
Message 54231 - Posted: 9 May 2012 | 13:53:26 UTC - in response to Message 54225.

primegrid计算的不是素数么?那为什么需要大量的浮点运算。那位能给我讲解下。谢谢。

Courtesy of Google Translate: primegrid calculate the prime numbers? Why do we need a large number of floating point operations. Who can give me to explain next. Thank you.


Excellent question! Assuming Google translated the question correctly, you're asking why we use floating point math in prime number calculations, even though prime numbers are integers.

The reason is speed. A lot of multiplications are performed during the prime number calculation, and those multiplications are done upon huge numbers which are often millions of digits long. The grammar school method of multiplying such huge numbers is extremely slow.

There's a much faster way of doing multiplication of huge numbers that uses Fourier transforms. Fourier transforms use floating point numbers, and that's why we need need floating point math in the prime number calculations.

Here's the Google translation of the answer back into Chinese:

很好的问题!假设谷歌翻译正确的问题,你问我们为什么使用浮点运算,即使在素数计算素数是整数。

其原因是速度。大量的乘法执行过程中的素数的计算,这些乘法是巨大的数字时,往往以百万计的位长。如此庞大的数字相乘语法学校的方法是极为缓慢。

有一个更快的方式做大量使用傅立叶变换的乘法。傅立叶变换使用浮点数,这就是为什么我们需要需要在素数计算的浮点运算。
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Message boards : News : The Cinco de Mayo Challenge. May 5 18:00 UTC

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