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

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MnStatusDetails
4970551Factored
FactorDigitsBitsDate
19389736210368850396126879889473036027939127.22022-10-27 07:00:17
ECM
DigitsB1Curves
25500009 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-05-23David Brlej2027922F6184AB190
Verified (Factored)2000-08-31Stephen Wood2027922F6184AB192146547
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-11-02Funky Waddle54A4A9D7E4DED3C21317815953
P-1 factors
DateFactorB1B2
2022-10-2719389736210368850396126879889473036027970000008975658510
History
DateUserTypeResult
2022-11-02lozcsCERT
PRP Certification
Proof certified good
2022-11-02Funky WaddleC-PRP
M4970551/193897362103688503961268798894730360279 : 54A4A9D7E4DED3C2
PRP proof power = 7
PRP: Verified
Proof certified good
2022-10-27Prism DaymonF-PM1
Factor: 193897362103688503961268798894730360279 / (P-1, B1=7000000, B2=8975658510)
2021-04-26-Anonymous-NF
no factor from 2^71 to 2^72
2021-04-24-Anonymous-NF
no factor from 2^70 to 2^71
2021-04-23-Anonymous-NF
no factor from 2^69 to 2^70
2021-03-08TJAOINF
no factor from 2^68 to 2^69
2018-06-05ramgeisNF
no factor from 2^67 to 2^68
2017-05-28YxinityNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^1 to 2^61
2015-07-29snme2pm1NF
no factor from 2^65 to 2^66
2015-04-24mikrNF-PM1
B1=1200000, B2=43100000, E=12
2014-12-29VictordeHollanderNF
no factor from 2^64 to 2^65
2014-12-29VictordeHollanderNF
no factor from 2^63 to 2^64
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2009-12-13markrNF
no factor from 2^61 to 2^62
2009-12-02markrNF-PM1
B1=75000, B2=1500000, E=6