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

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MnStatusDetails
10891891Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
447443093576572430022412375.22024-03-28 19:27:08
6257326157083949604622012479.02024-03-28 19:27:08
ECM
DigitsB1Curves
25500002 / 280
Estimated T-Level: 20.0 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2000-09-29Xiaohong Yang3DE91645F90210AE6060212
Verified (Factored)2004-02-07Peter Miller3DE91645F90210AE9807639
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2024-04-03Perig452820C6D58858422102861853
P-1 factors
DateFactorB1B2
2024-03-282799797373243248019580880466991632847823879244123000001663207260
History
DateUserTypeResult
2024-04-03themaandersonCERT
PRP Certification
Proof certified good
2024-04-03PerigC-PRP
M10891891/44744309357657243002241/625732615708394960462201 : 452820C6D5885842
PRP proof power = 8
PRP: Verified
Proof certified good
2024-03-28Sid & AndyF-PM1
Factors: 44744309357657243002241,625732615708394960462201 / (P-1, B1=2300000, B2=1663207260)
2021-10-29SRBaseNF
no factor from 2^71 to 2^72
2021-08-13SRBaseNF
no factor from 2^70 to 2^71
2020-09-17ViliamFNF
no factor from 2^69 to 2^70
2017-12-21ramgeisNF
no factor from 2^68 to 2^69
2017-12-21ramgeisNF
no factor from 2^67 to 2^68
2015-12-11VictordeHollanderNF
no factor from 2^66 to 2^67
2015-05-20ThaNF
no factor from 2^65 to 2^66
2013-12-08lycornNF
no factor from 2^64 to 2^65
2013-06-21NesowaNF-PM1
B1=210000, B2=4935000, E=6