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

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MnStatusDetails
10867217Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
9404458718555303939592169.72020-09-16 11:51:29
ECM
DigitsB1Curves
255000015 / 280
Estimated T-Level: 20.3 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2001-01-21Steve SpicerC0900BEA6BEA63F06023772
Verified (Factored)2004-04-20Fabrice BelletC0900BEA6BEA63F01550297
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-03-17riccardo uberti4B5B931001E35D961454132353
History
DateUserTypeResult
2025-06-16GregF
Factor: 940445871855530393959 / TF: 69-70
2021-03-17riccardo ubertiNF-PM1
B1=500000, B2=15000000, E=12
2021-03-17FractalismCERT
PRP Certification
Proof certified good
2021-03-17riccardo ubertiC-PRP
M10867217/940445871855530393959 : 4B5B931001E35D96
PRP proof power = 8
PRP: Verified
Proof certified good
2020-09-16ViliamFF
Factor: 940445871855530393959 / TF: 69-70*
2018-01-11ThaNF-PM1
B1=300000, B2=6000000, E=6
2017-12-27ramgeisNF
no factor from 2^68 to 2^69
2017-12-27ramgeisNF
no factor from 2^67 to 2^68
2015-12-11VictordeHollanderNF
no factor from 2^66 to 2^67
2015-05-18ThaNF
no factor from 2^65 to 2^66
2013-12-08lycornNF
no factor from 2^64 to 2^65