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

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MnStatusDetails
2920531Factored
FactorDigitsBitsDate
1291004460291467271715272476.82021-04-09 16:23:06
ECM
DigitsB1Curves
255000073 / 280
Estimated T-Level: 21.3 ⓘ
TF below 2^66 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Joel Armengaud23715C6A2F97BC0C0
Verified (Factored)Sturle Sunde23715C6A2F97BC0C0
Verified (Factored)2015-11-14MadPoo23715C6A2F97BC0C1577009
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-04-10XZT54F26C660B8E473B1144284153
History
DateUserTypeResult
2021-04-10curtiscCERT
PRP Certification
Proof certified good
2021-04-10XZTC-PRP
M2920531/129100446029146727171527 : 54F26C660B8E473B
PRP proof power = 7
PRP: Verified
Proof certified good
2021-04-09daveward2005F-ECM
Factor: 129100446029146727171527 / (ECM curve 6, B1=50000, B2=5000000, Sigma=4850406481045220)
2018-12-18chuenkitNF
no factor from 2^67 to 2^68
2017-11-22Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-02-22ramgeisNF
no factor from 2^65 to 2^66
2015-11-14MadPooC-LL
23715C6A2F97BC0C
2015-04-27VictordeHollanderNF-PM1
B1=1000000, B2=20000000, E=12
2015-04-25VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-25VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-07dbaughNF
no factor from 2^62 to 2^63
2011-12-25Grant McCrackenNF
no factor from 2^61 to 2^62
2010-11-14markrNF-PM1
B1=105000, B2=2283750, E=6
2010-11-13JossNF-PM1
B1=15000
2009-02-12Sturle SundeNF
no factor from 2^60 to 2^61