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

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MnStatusDetails
865643Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1731287720.7old
27631324571031.42008-07-16 09:27:59
7234114978178091549.42014-04-28 11:48:46
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-28Oliver Kruse4B115045C6BE47AF3013
Verified2017-10-14Oliver Kruse4B115045C6BE47AF330659013
Verified2017-12-20ATH4B115045C6BE47AF329527613
Verified2020-04-22Oliver Kruse953B181615F3B53B315644253
Verified2025-05-05kkmrkkblmbrbk953B181615F3B53B372938953
History
DateUserTypeResult
2025-05-05Land SharkCERT
PRP Certification
Proof certified good
2025-05-05kkmrkkblmbrbkC-PRP
M865643/1731287/2763132457/723411497817809 : 953B181615F3B53B
PRP proof power = 6
PRP: Verified
Proof certified good
2024-09-30timc995NF-PM1
B1=2000000, B2=44753558850
2020-04-22Oliver KruseC-PRP
M865643/1731287/2763132457/723411497817809 : 953B181615F3B53B
PRP: Verified
PRP without proof (small exponent)
2017-12-20ATHC-PRP
M865643/1731287/2763132457/723411497817809 : 4B115045C6BE47AF
PRP: Verified
PRP without proof (small exponent)
2017-10-14Oliver KruseC-PRP
M865643/1731287/2763132457/723411497817809 : 4B115045C6BE47AF
PRP: Verified
PRP without proof (small exponent)
2017-09-28Oliver KruseC-PRP
M865643/1731287/2763132457/723411497817809 : 4B115045C6BE47AF
PRP: Verified
PRP without proof (not generated)
2014-04-28TJAOIF
Factor: 723411497817809
2008-07-16J FeitsmaF
Factor: 2763132457