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

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Exponent Range:










MnStatusDetails
23887Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
17311864391030.7old
1943720413292471547.52008-08-26 19:59:08
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000005001 / 9201
Estimated T-Level: 42.7
TF below 2^137 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse558047B9039E8EBE2013
Verified2017-10-12kkmrkkblmbrbk558047B9039E8EBE21446313
Verified2020-04-17Oliver Kruse7E3B828909E525E921659253
Verified2024-07-01kkmrkkblmbrbk7E3B828909E525E92215953
History
DateUserTypeResult
2024-11-23masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2024-11-18masserNF-PP1
Start=126/29, B1=100000000, B2=99900000000
2024-11-14masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-07-01kkmrkkblmbrbkC-PRP
M23887/1731186439/194372041329247 : 7E3B828909E525E9
PRP: Verified
PRP without proof (small exponent)
2024-02-22nordiNF-PM1
B1=8000000000, B2=2427250412837250
2023-04-18nordiNF-PM1
B1=8000000000
2020-04-17Oliver KruseC-PRP
M23887/1731186439/194372041329247 : 7E3B828909E525E9
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M23887/1731186439/194372041329247 : 558047B9039E8EBE
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M23887/1731186439/194372041329247 : 558047B9039E8EBE
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M23887/1731186439/194372041329247 : 558047B9039E8EBE
PRP without proof (not generated)
2016-11-28kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12
2008-08-26-Anonymous-F-PM1
Factor: 194372041329247