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Message boards : Extended Sierpinski Problem : k=161041 Eliminated!

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Profile Michael GoetzProject donor
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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 (2,063,182)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 Turquoise: Earned 5,000,000 credits (6,459,937)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Sapphire: Earned 20,000,000 credits (34,221,148)SR5 LLR Turquoise: Earned 5,000,000 credits (8,293,415)SGS LLR Ruby: Earned 2,000,000 credits (2,012,222)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 (5,046,112)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 (10,106,174)GFN Emerald: Earned 50,000,000 credits (65,591,694)PSA Jade: Earned 10,000,000 credits (12,404,447)
Message 82470 - Posted: 14 Jan 2015 | 3:20:08 UTC

K=161041 Eliminated!

On January 6th, Martin Vanc (vmv) of the Czech Republic discovered the 2,139,716 digit mega prime:

161041*2^7107964+1

This is the first ESP k elimination in nearly two years. 11 k's remain in the Extended Sierpinski problem, plus the 14 remaining k's in the Sierpinski Problem (aka "Seventeen or Bust") and the Prime Sierpinski Problem.

This is the 23rd largest known prime number. It is PrimeGrid's first mega prime of 2015, and our 68th overall.

Coincidentally, 2 additional mega primes were found shortly afterwards. Within the span of less than 15 hours three mega primes were found at PrimeGrid. The other two primes, 177*2^3411847+1 and 245*2^3411974+1, are unrelated to the Sierpinski problems. That brings our total to 70 overall.

Link to the top 5K entry: http://primes.utm.edu/primes/page.php?id=119068
Link to the official announcement: http://www.primegrid.com/download/ESP-161041.pdf

As a result of eliminating this k, we've pulled the remaining candidates with k=161041 and n>7107964 from the system. A small number of those candidates were already in the pipeline to be processed, so there may be a few that get sent out. Over 10 thousand candidates with n<10M were removed. 161041 was the third "heaviest" remaining k. Only 202705 and 238411 had more candidates.

Since we'll no longer be testing k=161041, this k has also been removed from the sieve file used for the SoB/PSP/ESP sieve. If you're running the sieve, you will get the new sieve file as soon as you get a newly generated task. Expect a large, one time download, and slightly shorter sieve times.
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Message boards : Extended Sierpinski Problem : k=161041 Eliminated!

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