Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
25561Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
197626916391134.2old
11333204669942295076332269.92009-04-04 14:32:55
883926634442093938042154412686.22014-11-03 19:00:05
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000002459 / 9201
Estimated T-Level: 41.3
TF below 2^132 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse20E9C8A8B16BA5143013
Verified2017-10-02kkmrkkblmbrbk20E9C8A8B16BA5143013
Verified2017-12-07ATH20E9C8A8B16BA51432078613
Verified2020-04-17Oliver KruseE10DD4AE7E90CAC831115053
Verified2024-07-01kkmrkkblmbrbkE10DD4AE7E90CAC832517853
History
DateUserTypeResult
2024-11-22masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2024-11-20masserNF-PP1
Start=103/61, B1=100000000, B2=99900000000
2024-11-18masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-07-01kkmrkkblmbrbkC-PRP
M25561/1133320466994229507633/19762691639/88392663444209393804215441 : E10DD4AE7E90CAC8
PRP: Verified
PRP without proof (small exponent)
2024-03-01nordiNF-PM1
B1=8000000000, B2=2402750297697750
2023-05-02nordiNF-PM1
B1=8000000000
2020-04-17Oliver KruseC-PRP
M25561/19762691639/1133320466994229507633/88392663444209393804215441 : E10DD4AE7E90CAC8
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M25561/19762691639/1133320466994229507633/88392663444209393804215441 : 20E9C8A8B16BA514
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M25561/19762691639/1133320466994229507633/88392663444209393804215441 : 20E9C8A8B16BA514
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M25561/19762691639/1133320466994229507633/88392663444209393804215441 : 20E9C8A8B16BA514
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M25561/19762691639/1133320466994229507633/88392663444209393804215441 : 20E9C8A8B16BA514
PRP without proof (not generated)
2016-12-09kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12
2014-11-03James HintzF-ECM
Factor: 88392663444209393804215441 / (ECM curve 30, B1=250000, B2=25000000)
2009-04-04Matthias WurtingerF-ECM
Factor: 1133320466994229507633