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

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MnStatusDetails
2971747Factored
FactorDigitsBitsDate
1354241652841732049654392476.82020-11-17 23:51:28
ECM
DigitsB1Curves
255000036 / 280
Estimated T-Level: 20.6 ⓘ
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)John FrayA74802729676A7510
Verified (Factored)1999-06-15Nayan HajratwalaA74802729676A7511399541
Verified (Factored)2018-10-18kkmrkkblmbrbkA74802729676A7511894600
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-12-13Kirill Frolov99EAA064CF6168631191690253
History
DateUserTypeResult
2020-12-13Klaus NordmannCERT
PRP Certification
Proof certified good
2020-12-13Kirill FrolovC-PRP
M2971747/135424165284173204965439 : 99EAA064CF616863
PRP proof power = 7
PRP: Verified
Proof certified good
2020-11-17MarkSF-ECM
Factor: 135424165284173204965439 / (ECM curve 4, B1=50000, B2=5000000, Sigma=6802401106540666)
2018-12-25chuenkitNF
no factor from 2^67 to 2^68
2018-10-18kkmrkkblmbrbkC-LL
A74802729676A751
2017-12-03Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-28ramgeisNF
no factor from 2^65 to 2^66
2015-05-08VictordeHollanderNF-PM1
B1=1000000, B2=20000000, E=12
2015-04-29VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-29VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-07dbaughNF
no factor from 2^62 to 2^63
2011-11-29Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-10-27markrNF-PM1
B1=95000, B2=1995000, E=6
2009-02-12Sturle SundeNF
no factor from 2^60 to 2^61