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

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MnStatusDetails
23131Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
21881927824.4old
31235375623991341.52008-08-26 19:59:08
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000004945 / 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 Kruse1FD49C4B24E694D42013
Verified2017-10-12kkmrkkblmbrbk1FD49C4B24E694D4297513
Verified2020-04-17Oliver Kruse28FB3525E40D8BA722066753
Verified2024-07-01kkmrkkblmbrbk28FB3525E40D8BA721741453
History
DateUserTypeResult
2025-01-02masserNF-PP1
Start=165/19, B1=100000000, B2=99900000000
2025-01-02masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-12-19masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2024-07-01kkmrkkblmbrbkC-PRP
M23131/21881927/3123537562399 : 28FB3525E40D8BA7
PRP: Verified
PRP without proof (small exponent)
2023-12-31nordiNF-PM1
B1=8000000000, B2=2408138284051500
2023-04-24nordiNF-PM1
B1=8000000000
2020-04-17Oliver KruseC-PRP
M23131/21881927/3123537562399 : 28FB3525E40D8BA7
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M23131/21881927/3123537562399 : 1FD49C4B24E694D4
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M23131/21881927/3123537562399 : 1FD49C4B24E694D4
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M23131/21881927/3123537562399 : 1FD49C4B24E694D4
PRP without proof (not generated)
2016-11-28kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12
2008-08-26-Anonymous-F
Factor: 3123537562399