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

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MnStatusDetails
1872971Factored
FactorDigitsBitsDate
11945242346354335959150972580.02016-02-29 10:57:14
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 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)Joel SmithE2D07896BBFE18A50
Verified (Factored)1998-12-21chris clarkE2D07896BBFE18A51040775
Verified (Factored)2015-06-27MadPooE2D07896BBFE18A5307483
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver Kruse556CBD420A85ECBA1013
Verified2017-11-07ATH556CBD420A85ECBA1142076713
History
DateUserTypeResult
2017-11-07ATHC-PRP
M1872971/1194524234635433595915097 : 556CBD420A85ECBA
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1872971/1194524234635433595915097 : 556CBD420A85ECBA
PRP: Verified
PRP without proof (not generated)
2016-02-29bamF-ECM
Factor: 1194524234635433595915097 / (ECM curve 3, B1=50000, B2=5000000)
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-10-07Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-11ramgeisNF
no factor from 2^65 to 2^66
2015-06-27MadPooC-LL
E2D07896BBFE18A5
2015-05-08snme2pm1NF
no factor from 2^64 to 2^65
2015-05-08snme2pm1NF
no factor from 2^63 to 2^64
2012-01-10markrNF-PM1
B1=275000, B2=6000000, E=12
2011-03-08GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-11Architects CubedNF
no factor from 2^60 to 2^61