Marin Mersenne 2^P-1
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MnStatusDetails
2560211Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
210080021104064125755672374.22020-09-04 20:04:19
ECM
DigitsB1Curves
2550000132 / 280
Estimated T-Level: 22.4 ⓘ
TF below 2^69 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Mike Barnett3735B89BBD69B6370
Verified (Factored)1999-04-13Adam E. Roberts3735B89BBD69B637787192
Verified (Factored)2018-06-13kkmrkkblmbrbk3735B89BBD69B63761570
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-09-05jvang138608C8DA1BBC9F147932453
History
DateUserTypeResult
2020-09-06Ben DeloCERT
PRP Certification
Proof certified good
2020-09-05jvangC-PRP
M2560211/21008002110406412575567 : 138608C8DA1BBC9F
PRP proof power = 7
PRP: Verified
Proof certified good
2020-09-04alpertronF-ECM
Factor: 21008002110406412575567 / (ECM curve 3, B1=50000, B2=5000000, Sigma=3821850493497019)
2019-07-01TJAOINF
no factor from 2^67 to 2^68
2018-06-13kkmrkkblmbrbkC-LL
3735B89BBD69B637
2017-08-11Gordon SpenceNF
no factor from 2^66 to 2^67
2016-04-23mikrNF-PM1
B1=3200000, B2=112000000, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-08omylistNF
no factor from 2^65 to 2^66
2015-02-23VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-23VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-23dbaughNF
no factor from 2^62 to 2^63
2012-06-16Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-04-12James HeinrichNF-PM1
B1=175000, B2=4068750, E=6
2011-01-10JossNF-PM1
B1=50000
2011-01-03JossNF-PM1
B1=30000
2010-12-21JossNF-PM1
B1=20000
2009-02-01Sturle SundeNF
no factor from 2^60 to 2^61