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

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MnStatusDetails
2152831Factored
FactorDigitsBitsDate
40518051129859879271961.82009-01-06 18:27:43
8391522252715771809112169.52016-03-24 11:58:32
9466282916851603456632169.72022-08-13 17:57:43
ECM
DigitsB1Curves
255000098 / 280
Estimated T-Level: 21.8 ⓘ
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Bob Farrington1993EDF61504CE9C0
Verified (Factored)1999-05-02Ruediger K. Eckhard1993EDF61504CE9C539927
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-08Oliver KruseC1900CD93ADD28521013
Verified (Factored)2017-10-17Oliver KruseD0B1AB44F18C9D712210423553
Verified (Factored)2017-11-18Chang Chia-TcheD0B1AB44F18C9D712117200753
Verified2022-08-15_p95holder_D0B1AB44F18C9D713111263353
P-1 factors
DateFactorB1B2
2016-03-2483915222527157718091150000015000000
History
DateUserTypeResult
2022-08-15_p95holder_C-PRP
M2152831/4051805112985987927/839152225271577180911/946628291685160345663 : D0B1AB44F18C9D71
PRP: Verified
PRP without proof (not generated)
2022-08-13_p95holder_F-ECM
Factor: 946628291685160345663 / (ECM curve 4, B1=50000, B2=5000000)
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-18Chang Chia-TcheC-PRP
M2152831/4051805112985987927/839152225271577180911 : D0B1AB44F18C9D71
PRP: Verified
PRP without proof (not generated)
2017-10-17Oliver KruseC-PRP
M2152831/4051805112985987927/839152225271577180911 : D0B1AB44F18C9D71
PRP: Verified
PRP without proof (not generated)
2017-10-08Oliver KruseC-PRP
M2152831/4051805112985987927/839152225271577180911 : C1900CD93ADD2852
PRP: Verified
PRP without proof (not generated)
2016-03-24alpertronF-PM1
Factor: 839152225271577180911 / (P-1, B1=500000, B2=15000000, E=12)
2009-01-06Sturle SundeF
Factor: 4051805112985987927
2009-01-04Sturle SundeNF
no factor from 2^60 to 2^61