Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnDetails
8901773
Composite, with 3 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 268
Factored
FactorDigitsBitsDate
12799325290331340.2old
1058568249790411822572166.52020-05-06 11:45:44
161242360632880569278712373.82020-05-27 17:11:41
P-1 factors
DateFactorsB1B2
2020-05-2716124236063288056927871
50000010000000
ECM
DigitsB1Curves
255000047 / 280
Estimated T-Level: 20.8 ⓘ
TF below 2^64 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
PRP without proof (not generated)
2019-03-27trebor08157856D65418BD1481756353
Factored
PRP without proof (not generated)
2020-05-07riccardo uberti08157856D65418BD2648529053
Verified
PRP without proof (not generated)
2020-05-29Luigi Morelli08157856D65418BD3609861453
History
DateUserTypeResult
2025-05-11beepNF-PM1B1=1900000, B2=10254344100
2021-05-12riccardo ubertiNF-PP1Start=2/7, B1=1500000, B2=30000000
2021-05-09riccardo ubertiNF-PP1Start=6/5, B1=1500000, B2=30000000
2020-05-29Luigi MorelliC-PRPM8901773/1279932529033/105856824979041182257/16124236063288056927871 : 08157856D65418BD
2020-05-27riccardo ubertiF-PM1Factor: 16124236063288056927871 / B1=500000, B2=10000000
2020-05-07riccardo ubertiC-PRPM8901773/1279932529033/105856824979041182257 : 08157856D65418BD
2020-05-06TJAOIFFactor: 105856824979041182257
2019-03-27treborC-PRPM8901773/1279932529033 : 08157856D65418BD