Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
6220651Factored
FactorDigitsBitsDate
1174659336840610902302987076313096.62021-10-06 15:09:51
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-12-21Stephen WoodBC894E88FF4515D70
Verified (Factored)2001-01-14Jan JohannsenBC894E88FF4515D73721845
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-10-06firejugglerA04D999F96F1318F1185441153
P-1 factors
DateFactorB1B2
2021-10-061174659336840610902302987076313000000243000000
History
DateUserTypeResult
2021-10-06curtiscCERT
PRP Certification
Proof certified good
2021-10-06firejugglerC-PRP
M6220651/117465933684061090230298707631 : A04D999F96F1318F
PRP proof power = 7
PRP: Verified
Proof certified good
2021-10-06firejugglerF-PM1
Factor: 117465933684061090230298707631 / (P-1, B1=3000000, B2=243000000)
2021-09-19SRBaseNF
no factor from 2^71 to 2^72
2021-08-21SRBaseNF
no factor from 2^70 to 2^71
2020-11-22takahashiNF
no factor from 2^69 to 2^70
2020-04-02takahashiNF
no factor from 2^68 to 2^69
2019-09-29takahashiNF-PM1
B1=600000, B2=12000000, E=12
2018-06-01ramgeisNF
no factor from 2^67 to 2^68
2016-03-19Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-12snme2pm1NF
no factor from 2^65 to 2^66
2014-09-17monstNF
no factor from 2^64 to 2^65
2014-09-12NesowaNF
no factor from 2^63 to 2^64
2013-04-11Squeeky_SquirrelNF-PM1
B1=115000, B2=2300000, E=6