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

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Exponent Range:










MnStatusDetails
162221Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
234571567927.8old
234150630442700631754.42009-01-25 15:09:05
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000182 / 1566
Estimated T-Level: 30.6
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver KruseFF1DD43A643714492013
Verified2017-10-11kkmrkkblmbrbkFF1DD43A64371449211348513
Verified2020-04-17Oliver Kruse8B67E4174D865A79215890353
Verified2024-02-03Wentao Huang8B67E4174D865A79214903753
History
DateUserTypeResult
2024-02-03Naegi MakotoCERT
PRP Certification
Proof certified good
2024-02-03Wentao HuangC-PRP
M162221/234571567/23415063044270063 : 8B67E4174D865A79
PRP proof power = 5
PRP: Verified
Proof certified good
2021-07-08ATHNF-PP1
Start=2/7, B1=15000000, B2=1500000000
2020-04-17Oliver KruseC-PRP
M162221/234571567/23415063044270063 : 8B67E4174D865A79
PRP: Verified
PRP without proof (small exponent)
2017-10-11kkmrkkblmbrbkC-PRP
M162221/234571567/23415063044270063 : FF1DD43A64371449
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M162221/234571567/23415063044270063 : FF1DD43A64371449
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M162221/234571567/23415063044270063 : FF1DD43A64371449
PRP without proof (not generated)
2017-04-23kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12
2009-01-25George WoltmanF
Factor: 23415063044270063