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

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MnStatusDetails
2550949Factored
FactorDigitsBitsDate
710832543140932858552632375.92020-07-10 14:24:25
ECM
DigitsB1Curves
255000044 / 280
Estimated T-Level: 20.8 ⓘ
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jeff Hungerford9CB1841F7E04D1290
Verified (Factored)1999-09-22Achim Passauer9CB1841F7E04D1291434900
Verified (Factored)2018-06-12kkmrkkblmbrbk9CB1841F7E04D129774309
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-07-11pew86BD763CE6348767152662053
Verified2020-07-13nordi86BD763CE63487671132465553
History
DateUserTypeResult
2020-07-13nordiC-PRP
M2550949/71083254314093285855263 : 86BD763CE6348767
PRP: Verified
PRP without proof (not generated)
2020-07-11pewC-PRP
M2550949/71083254314093285855263 : 86BD763CE6348767
PRP: Verified
PRP without proof (not generated)
2020-07-10debrouxlF-ECM
Factor: 71083254314093285855263 / (ECM curve 2, B1=50000, B2=5000000)
2019-07-31TJAOINF
no factor from 2^67 to 2^68
2018-06-12kkmrkkblmbrbkC-LL
9CB1841F7E04D129
2017-08-10Gordon SpenceNF
no factor from 2^66 to 2^67
2016-03-16mikrNF-PM1
B1=3200000, B2=112000000, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-02omylistNF
no factor from 2^65 to 2^66
2015-02-23VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-23VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-06-16Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-04-08James HeinrichNF-PM1
B1=175000, B2=4068750, E=6
2011-01-09JossNF-PM1
B1=50000
2010-12-19JossNF-PM1
B1=20000
2009-01-31Sturle SundeNF
no factor from 2^60 to 2^61