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

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MnStatusDetails
3803561Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
622862709264617019029832375.72016-05-16 17:55:03
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)Janne BergmanEBE969189F61524B0
Verified (Factored)1999-09-07Vaughn HughesEBE969189F61524B159448
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbkC46516CC584B98E71013
Verified2017-12-10Oliver KruseC46516CC584B98E71371133813
P-1 factors
DateFactorB1B2
2016-05-1662286270926461701902983200000062000000
History
DateUserTypeResult
2022-05-25JossNF-PM1
B1=200000, B2=130364850
2017-12-10Oliver KruseC-PRP
M3803561/62286270926461701902983 : C46516CC584B98E7
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M3803561/62286270926461701902983 : C46516CC584B98E7
PRP: Verified
PRP without proof (not generated)
2016-05-16mikrF-PM1
Factor: 62286270926461701902983 / (P-1, B1=2000000, B2=62000000, E=12)
2016-02-25ramgeisNF
no factor from 2^65 to 2^66
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-01-04Squeeky_SquirrelNF-PM1
B1=180000, B2=4950000, E=6
2015-01-18VictordeHollanderNF
no factor from 2^64 to 2^65
2015-01-18VictordeHollanderNF
no factor from 2^63 to 2^64
2014-09-18JossNF-PM1
B1=81875
2012-02-29GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-11-06Squeeky_SquirrelNF-PM1
B1=65000, B2=1121250, E=6
2011-03-06markrNF
no factor from 2^61 to 2^62
2009-07-11Carsten KossendeyNF-PM1
B1=20000, B2=270000
2009-03-01S485122NF
no factor from 2^60 to 2^61