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

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Exponent Range:










MnStatusDetails
1264213Factored
FactorDigitsBitsDate
383764257091732769010891545351331101.62022-04-18 22:42:20
24884365751628770043667700744115986459939127.52022-04-18 22:42:20
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski19260
Verified (Factored)Robert Clark5007D6FE3211F9260
Verified (Factored)2002-08-31Mark Outhier5007D6FE3211F9261013245
Verified (Factored)2016-06-01MadPoo5007D6FE3211F926792935
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-04-20zr_zircon22DA43A2636B760B26970953
P-1 factors
DateFactorB1B2
2022-04-1895497301358727732511086952652561090314991493334746704862553375888628741000000118126324680
History
DateUserTypeResult
2022-04-20Massimo Cappelli (ik5pwa)CERT
PRP Certification
Proof certified good
2022-04-20zr_zirconC-PRP
M1264213/3837642570917327690108915453513/248843657516287700436677007441159864599 : 22DA43A2636B760B
PRP proof power = 6
PRP: Verified
Proof certified good
2022-04-18Sid & AndyF-PM1
Factor: 954973013587277325110869526525610903149914933347467048625533758886287 / (P-1, B1=41000000, B2=118126324680)
2020-05-02Gordon SpenceNF
no factor from 2^67 to 2^68
2018-09-16YxinityNF
no factor from 2^66 to 2^67
2016-06-01MadPooC-LL
5007D6FE3211F926
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-09-23ramgeisNF
no factor from 2^65 to 2^66
2015-04-09monstNF
no factor from 2^64 to 2^65
2015-04-08omylistNF
no factor from 2^63 to 2^64
2015-02-09mikrNF-PM1
B1=4218475, B2=156083565, E=12
2014-09-29JossNF-PM1
B1=250770
2012-10-11dbaughNF
no factor from 2^62 to 2^63
2011-05-09XyzzyNF
no factor from 2^61 to 2^62
2009-02-16Sturle SundeNF
no factor from 2^60 to 2^61