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

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Exponent Range:










MnStatusDetails
265957Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1595743720.6old
4255313722.02008-07-21 09:15:22
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000184 / 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 Kruse2882D46B5A947CC82013
Verified2017-10-12kkmrkkblmbrbk2882D46B5A947CC8221708113
Verified2020-04-17Oliver Kruse961BB2409AAA079B23758953
Verified2024-08-01kkmrkkblmbrbk961BB2409AAA079B214372353
History
DateUserTypeResult
2024-10-21yuriy_5-1NF-PM1
B1=24468044, B2=5977750478700
2024-08-01John DalbecCERT
PRP Certification
Proof certified good
2024-08-01kkmrkkblmbrbkC-PRP
M265957/1595743/4255313 : 961BB2409AAA079B
PRP proof power = 5
PRP: Verified
Proof certified good
2022-03-20Lisander ViaeneNF-PM1
B1=5550000, B2=25042991610
2022-03-19Lisander ViaeneNF-PM1
B1=5550000
2022-01-03Lisander ViaeneNF-PM1
B1=100000
2020-04-17Oliver KruseC-PRP
M265957/1595743/4255313 : 961BB2409AAA079B
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M265957/1595743/4255313 : 2882D46B5A947CC8
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M265957/1595743/4255313 : 2882D46B5A947CC8
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M265957/1595743/4255313 : 2882D46B5A947CC8
PRP without proof (not generated)
2008-07-21J FeitsmaF
Factor: 4255313