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

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MnStatusDetails
355517Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
19908953824.2old
752985007929.52008-07-21 09:17:37
ECM
DigitsB1Curves
2550000280 / 280
30250000500 / 640
Estimated T-Level: 28.9
TF below 2^91 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-23Oliver Kruse5DB2C93EB2C1C6342013
Verified2017-10-13kkmrkkblmbrbk5DB2C93EB2C1C634210523713
Verified2020-04-18Oliver Kruse6B5F38DD948E8D3325627153
Verified2024-09-18kkmrkkblmbrbk6B5F38DD948E8D33215706653
History
DateUserTypeResult
2024-10-11yuriy_5-1NF-PM1
B1=12000002, B2=2124117455460
2024-09-18LOBESCERT
PRP Certification
Proof certified good
2024-09-18kkmrkkblmbrbkC-PRP
M355517/19908953/752985007 : 6B5F38DD948E8D33
PRP proof power = 5
PRP: Verified
Proof certified good
2023-12-03USAFSSNF-PM1
B1=1530000, B2=5367308100
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-18Oliver KruseC-PRP
M355517/19908953/752985007 : 6B5F38DD948E8D33
PRP: Verified
PRP without proof (small exponent)
2017-10-13kkmrkkblmbrbkC-PRP
M355517/19908953/752985007 : 5DB2C93EB2C1C634
PRP: Verified
PRP without proof (small exponent)
2017-09-23Oliver KruseC-PRP
M355517/19908953/752985007 : 5DB2C93EB2C1C634
PRP: Verified
PRP without proof (not generated)
2017-09-23Oliver KruseC-PRP
M355517/19908953/752985007 : 5DB2C93EB2C1C634
PRP without proof (not generated)
2008-07-21J FeitsmaF
Factor: 752985007