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

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MnStatusDetails
3403021Factored
FactorDigitsBitsDate
644051128550202775188975183549177067937122.32021-03-30 11:36:30
ECM
DigitsB1Curves
255000022 / 280
Estimated T-Level: 20.4 ⓘ
TF below 2^63 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Dax PratherA7AD28A0B1A54EBD0
Verified (Factored)1999-12-08Dan and Hannah RubinA7AD28A0B1A54EBD2830710
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-03-31Chad Steenerson 633F13AE4F0BC6281134517353
P-1 factors
DateFactorB1B2
2021-03-30644051128550202775188975183549177067915000000750000000
History
DateUserTypeResult
2022-07-17JossNF-PM1
B1=3403021, B2=3446651670
2022-04-08JossNF-PM1
B1=1000000, B2=145126800
2021-03-31kutensCERT
PRP Certification
Proof certified good
2021-03-31Chad Steenerson C-PRP
M3403021/6440511285502027751889751835491770679 : 633F13AE4F0BC628
PRP proof power = 7
PRP: Verified
Proof certified good
2021-03-30axnF-PM1
Factor: 6440511285502027751889751835491770679 / (P-1, B1=15000000, B2=750000000)
2020-12-25axnNF
no factor from 2^68 to 2^69
2020-02-08BigBrotherNF-PM1
B1=3000000, B2=90000000, E=12
2019-02-18TJAOINF
no factor from 2^67 to 2^68
2017-01-26Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-04-06Gordon SpenceNF
no factor from 2^65 to 2^66
2015-01-30VictordeHollanderNF
no factor from 2^64 to 2^65
2015-01-30VictordeHollanderNF
no factor from 2^63 to 2^64
2012-08-18GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-10-27markrNF-PM1
B1=225000, B2=5737500, E=12
2011-08-12Grant McCrackenNF
no factor from 2^61 to 2^62
2009-07-03Carsten KossendeyNF-PM1
B1=15000, B2=206250
2009-03-26S485122NF
no factor from 2^60 to 2^61