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

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MnStatusDetails
2721317Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
16327903824.0old
117948326875681718308332373.32022-11-16 02:24:46
ECM
DigitsB1Curves
255000057 / 280
Estimated T-Level: 21.0
TF below 2^65 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-19Oliver Kruse1CA9FF71CAE86DE01128120753
Verified (Factored)2017-12-05kkmrkkblmbrbk1CA9FF71CAE86DE01892353
Verified2022-11-18LordJulius1CA9FF71CAE86DE0268869953
P-1 factors
DateFactorB1B2
2022-11-1611794832687568171830833255000203416290
History
DateUserTypeResult
2022-11-18daekazCERT
PRP Certification
Proof certified good
2022-11-18LordJuliusC-PRP
M2721317/16327903/11794832687568171830833 : 1CA9FF71CAE86DE0
PRP proof power = 7
PRP: Verified
Proof certified good
2022-11-16USAFSSF-PM1
Factor: 11794832687568171830833 / (P-1, B1=255000, B2=203416290)
2017-12-05kkmrkkblmbrbkC-PRP
M2721317/16327903 : 1CA9FF71CAE86DE0
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-19Oliver KruseC-PRP
M2721317/16327903 : 1CA9FF71CAE86DE0
PRP: Verified (Factored)
PRP without proof (not generated)