Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
855527Factored
FactorDigitsBitsDate
6203948633718823047772169.12016-01-04 13:22:10
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David SlowinskiD550
Verified (Factored)Horng-Ming ChenB61D1F31E26B8D550
Verified (Factored)2001-08-04Brian J. BeesleyB61D1F31E26B8D5543026
Verified (Factored)2015-04-11MadPooB61D1F31E26B8D55410403
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-28Oliver Kruse867BEFD5BF94B2741013
Verified2017-10-14Oliver Kruse867BEFD5BF94B274168992413
Verified2017-12-17ATH867BEFD5BF94B274171087913
Unverified (Reliable)2020-04-22Oliver Kruse27841484BE0392__154286153
History
DateUserTypeResult
2020-04-22Oliver KruseC-PRP
M855527/620394863371882304777 : 27841484BE0392__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-12-17ATHC-PRP
M855527/620394863371882304777 : 867BEFD5BF94B274
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-10-14Oliver KruseC-PRP
M855527/620394863371882304777 : 867BEFD5BF94B274
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-28Oliver KruseC-PRP
M855527/620394863371882304777 : 867BEFD5BF94B274
PRP: Unverified (Reliable)
PRP without proof (not generated)
2017-02-24ConductorNF
no factor from 2^67 to 2^68
2017-02-24ConductorNF
no factor from 2^66 to 2^67
2017-02-24ConductorNF
no factor from 2^65 to 2^66
2017-02-24ConductorNF
no factor from 2^64 to 2^65
2017-02-24ConductorNF
no factor from 2^63 to 2^64
2017-02-24ConductorNF
no factor from 2^62 to 2^63
2017-02-24ConductorNF
no factor from 2^61 to 2^62
2017-02-24ConductorNF
no factor from 2^60 to 2^61
2016-01-04ConductorF-ECM
Factor: 620394863371882304777 / (ECM curve 1, B1=50000, B2=5000000)
2015-12-03Sid & AndyNF-PM1
B1=8555270, B2=256658100, E=12
2015-10-04Gordon SpenceNF
no factor from 2^63 to 2^64
2015-10-04Gordon SpenceNF
no factor from 2^62 to 2^63
2015-04-11MadPooC-LL
B61D1F31E26B8D55
2015-02-13TJAOINF
no factor from 2^61 to 2^62
2010-05-29Architects CubedNF
no factor from 2^60 to 2^61
2010-01-09BigBrotherNF-PM1
B1=2000000, B2=40000000, E=12
2009-08-30Carsten KossendeyNF-PM1
B1=855527
2008-10-12Sturle SundeNF
no factor from 2^59 to 2^60
2008-10-12Sturle SundeNF
no factor from 2^58 to 2^59