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

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Exponent Range:










MnStatusDetails
28429Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
12230449505684811650.1old
108844586493395380012063.22008-08-26 19:59:19
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
403000000830 / 4588
Estimated T-Level: 35.9
TF below 2^114 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseC6B7ABEECA9053CA2013
Verified2017-10-12kkmrkkblmbrbkC6B7ABEECA9053CA2393613
Verified2020-04-17Oliver Kruse2A8F69AD8420DCB921945153
Verified2024-07-01kkmrkkblmbrbk2A8F69AD8420DCB92949453
History
DateUserTypeResult
2024-11-22masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2024-11-17masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-11-12masserNF-PP1
Start=182/17, B1=100000000, B2=99900000000
2024-07-01kkmrkkblmbrbkC-PRP
M28429/10884458649339538001/1223044950568481 : 2A8F69AD8420DCB9
PRP: Verified
PRP without proof (small exponent)
2023-02-18nordiNF-PM1
B1=3000000000, B2=925584566816910
2022-10-13nordiNF-PM1
B1=3000000000
2020-04-17Oliver KruseC-PRP
M28429/1223044950568481/10884458649339538001 : 2A8F69AD8420DCB9
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M28429/1223044950568481/10884458649339538001 : C6B7ABEECA9053CA
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M28429/1223044950568481/10884458649339538001 : C6B7ABEECA9053CA
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M28429/1223044950568481/10884458649339538001 : C6B7ABEECA9053CA
PRP without proof (not generated)
2016-12-28kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12
2008-08-26-Anonymous-F-ECM
Factor: 10884458649339538001