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

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MnStatusDetails
2498603Factored
FactorDigitsBitsDate
610760492400618871733212375.72020-06-09 10:42:14
ECM
DigitsB1Curves
255000040 / 280
Estimated T-Level: 20.7
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Kees HoogakkerBE3EB459067E3E4B0
Verified (Factored)1999-05-16Lawrence NgBE3EB459067E3E4B2072335
Verified (Factored)2018-06-02kkmrkkblmbrbkBE3EB459067E3E4B1709424
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-06-10M Miller07E0942D2F7FE2841154727453
Verified2020-06-12Luigi Morelli07E0942D2F7FE2841180397553
History
DateUserTypeResult
2020-06-12Luigi MorelliC-PRP
M2498603/61076049240061887173321 : 07E0942D2F7FE284
PRP: Verified
PRP without proof (not generated)
2020-06-10M MillerC-PRP
M2498603/61076049240061887173321 : 07E0942D2F7FE284
PRP: Verified
PRP without proof (not generated)
2020-06-09GANF-ECM
Factor: 61076049240061887173321 / (ECM curve 1, B1=50000, B2=5000000)
2019-03-04TJAOINF
no factor from 2^67 to 2^68
2018-06-02kkmrkkblmbrbkC-LL
BE3EB459067E3E4B
2017-07-27Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-10-31ramgeisNF
no factor from 2^65 to 2^66
2015-03-03VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-03VictordeHollanderNF
no factor from 2^63 to 2^64
2014-12-16mikrNF-PM1
B1=2382500, B2=85770100, E=12
2014-09-10JossNF-PM1
B1=120688
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-06-11Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-25Oscar ÖstlinNF-PM1
B1=95000, B2=1971250, E=6
2010-12-16JossNF-PM1
B1=20000
2009-01-11Sturle SundeNF
no factor from 2^60 to 2^61