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

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MnStatusDetails
2219801Factored
FactorDigitsBitsDate
1096605521832223759158072476.52020-04-08 18:45:00
ECM
DigitsB1Curves
255000063 / 280
Estimated T-Level: 21.1 ⓘ
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Linton5F6C2D3AFA0604F20
Verified (Factored)1999-02-07chris clark5F6C2D3AFA0604F21023806
Verified (Factored)2018-04-18kkmrkkblmbrbk5F6C2D3AFA0604F2622753
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-04-09mrh905B610A6807D90D1205229753
Verified2020-04-09marssystems905B610A6807D90D189619253
History
DateUserTypeResult
2020-04-09marssystemsC-PRP
M2219801/109660552183222375915807 : 905B610A6807D90D
PRP: Verified
PRP without proof (not generated)
2020-04-09mrhC-PRP
M2219801/109660552183222375915807 : 905B610A6807D90D
PRP: Verified
PRP without proof (not generated)
2020-04-08daveward2005F-ECM
Factor: 109660552183222375915807 / (ECM curve 3, B1=50000, B2=5000000)
2019-04-22TJAOINF
no factor from 2^67 to 2^68
2018-04-18kkmrkkblmbrbkC-LL
5F6C2D3AFA0604F2
2016-12-23Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-12-19Alexander DubrovinNF-PM1
B1=2000000, B2=65000000, E=12
2015-11-19Alexander DubrovinNF-PM1
B1=1500000, B2=6000000, E=6
2015-11-19Alexander DubrovinNF-PM1
B1=1000000, B2=5000000, E=6
2015-10-23ramgeisNF
no factor from 2^65 to 2^66
2015-04-30Squeeky_SquirrelNF-PM1
B1=160000, B2=4600000, E=6
2015-03-06VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-06VictordeHollanderNF
no factor from 2^63 to 2^64
2014-09-29JossNF-PM1
B1=142828
2014-05-26JossNF-PM1
B1=113914
2013-08-20David CampeauNF
no factor from 2^62 to 2^63
2012-04-18Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-12-20Oscar ÖstlinNF-PM1
B1=85000, B2=1593750, E=6
2010-10-12Oscar ÖstlinNF-PM1
B1=75011
2009-01-11Sturle SundeNF
no factor from 2^60 to 2^61