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

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MnStatusDetails
2163923Factored
FactorDigitsBitsDate
199116635732591570277706792684.02021-03-06 13:41:31
ECM
DigitsB1Curves
2550000156 / 280
Estimated T-Level: 22.8
TF below 2^71 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jay BolsterE237391CC9A506A70
Verified (Factored)1998-04-11Tom CageE237391CC9A506A70
Verified (Factored)1999-02-21Ethan O'ConnorE237391CC9A506A7862463
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2021-03-06riccardo uberti81FD2CC96337024E145424053
History
DateUserTypeResult
2021-03-06Ben DeloCERT
PRP Certification
Proof certified good
2021-03-06riccardo ubertiC-PRP
M2163923/19911663573259157027770679 : 81FD2CC96337024E
PRP proof power = 7
PRP: Verified
Proof certified good
2021-03-06mnd9F-ECM
Factor: 19911663573259157027770679 / (ECM curve 6, B1=50000, B2=5000000, Sigma=3404102307612190)
2019-10-23mikrNF-PM1
B1=5000000, B2=200000000, E=12
2019-05-13TJAOINF
no factor from 2^67 to 2^68
2017-08-24JossNF-PM1
B1=752716, B2=7527160, E=12
2017-08-22JossNF-PM1
B1=627264, B2=6272640, E=12
2017-06-28JossNF-PM1
B1=522720, B2=5227200, E=6
2017-06-09JossNF-PM1
B1=435600, B2=4356000, E=6
2017-05-13JossNF-PM1
B1=363000, B2=3630000, E=6
2016-11-10Gordon SpenceNF
no factor from 2^66 to 2^67
2016-09-11JossNF-PM1
B1=181500, B2=14417920, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-12-30ramgeisNF
no factor from 2^65 to 2^66
2015-03-25VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-25VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-23dbaughNF
no factor from 2^62 to 2^63
2009-01-08Sturle SundeNF
no factor from 2^61 to 2^62
2009-01-04Sturle SundeNF
no factor from 2^60 to 2^61