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Message boards : Fermat Divisor Search : Success! Fermat Divisor Found!

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Profile JeppeSNProject donor
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Joined: 5 Apr 14
Posts: 1533
ID: 306875
Credit: 35,628,944
RAC: 9,752
Found 1 prime in the 2020 Tour de Primes321 LLR Gold: Earned 500,000 credits (529,293)Cullen LLR Gold: Earned 500,000 credits (611,298)ESP LLR Silver: Earned 100,000 credits (174,818)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (35,236)PPS LLR Jade: Earned 10,000,000 credits (13,162,537)PSP LLR Silver: Earned 100,000 credits (428,457)SoB LLR Silver: Earned 100,000 credits (466,812)SR5 LLR Silver: Earned 100,000 credits (145,419)SGS LLR Silver: Earned 100,000 credits (112,277)TRP LLR Silver: Earned 100,000 credits (342,501)Woodall LLR Silver: Earned 100,000 credits (109,455)321 Sieve (suspended) Silver: Earned 100,000 credits (175,037)PPS Sieve Bronze: Earned 10,000 credits (10,113)AP 26/27 Bronze: Earned 10,000 credits (12,129)GFN Ruby: Earned 2,000,000 credits (2,059,478)WW Turquoise: Earned 5,000,000 credits (9,640,000)PSA Turquoise: Earned 5,000,000 credits (7,614,290)
Message 136641 - Posted: 24 Jan 2020 | 13:43:16 UTC - in response to Message 132601.

All known Fermat divisors are listed here. We expect this search to find about two new Fermat divisors; it has about an 85% chance of finding at least one. With the exception of the small k=19683 candidates, any new Fermat divisor found in this subproject would overtake 193*2^3329782+1 as the largest one known.


Success! We found 13*2^5523860+1 as a factor of

F5523858 = 2^(2^5523858) + 1

See work unit (until it is purged) and Top 5k entry and current Top 20. Will probably soon appear on fermatsearch.org and on prothsearch.com.

The lucky finder now has two F badges.

An official announcement from PrimeGrid will appear.

/JeppeSN

Profile JeppeSNProject donor
Avatar
Send message
Joined: 5 Apr 14
Posts: 1533
ID: 306875
Credit: 35,628,944
RAC: 9,752
Found 1 prime in the 2020 Tour de Primes321 LLR Gold: Earned 500,000 credits (529,293)Cullen LLR Gold: Earned 500,000 credits (611,298)ESP LLR Silver: Earned 100,000 credits (174,818)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (35,236)PPS LLR Jade: Earned 10,000,000 credits (13,162,537)PSP LLR Silver: Earned 100,000 credits (428,457)SoB LLR Silver: Earned 100,000 credits (466,812)SR5 LLR Silver: Earned 100,000 credits (145,419)SGS LLR Silver: Earned 100,000 credits (112,277)TRP LLR Silver: Earned 100,000 credits (342,501)Woodall LLR Silver: Earned 100,000 credits (109,455)321 Sieve (suspended) Silver: Earned 100,000 credits (175,037)PPS Sieve Bronze: Earned 10,000 credits (10,113)AP 26/27 Bronze: Earned 10,000 credits (12,129)GFN Ruby: Earned 2,000,000 credits (2,059,478)WW Turquoise: Earned 5,000,000 credits (9,640,000)PSA Turquoise: Earned 5,000,000 credits (7,614,290)
Message 148585 - Posted: 12 Feb 2021 | 16:28:34 UTC

Should have updated this thread earlier. A new success:

27*2^7963247+1 is a factor of

F7963245 = 2^(2^7963245) + 1

Links to work unit (link will die soon) and Top 5000 entry. Links in my first post to Top 20, to fermatsearch.org and to prothsearch.com are unchanged. (Record F divisor currently belongs outside PrimeGrid.)

Finder's first F badge.

A list, generated on click, of all PrimeGrid's F divisors, with relevant links, is at https://www.primegrid.com/primes/primes.php?project=ALL&factors=F&only=ONLY.

/JeppeSN

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Message boards : Fermat Divisor Search : Success! Fermat Divisor Found!

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