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

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MnStatusDetails
66617Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1117727448112058492362316712786.52016-12-09 13:15:41
4054869472684830553196840332788.4old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
403000000534 / 4588
Estimated T-Level: 35.6
TF below 2^113 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse60BA5FFD00A892902013
Verified2017-10-02kkmrkkblmbrbk60BA5FFD00A892902013
Verified2017-12-07ATH60BA5FFD00A8929021991413
Verified2020-04-17Oliver Kruse2A12C55332D73CBA2719753
Verified2024-02-03Wentao Huang2A12C55332D73CBA22839053
History
DateUserTypeResult
2024-02-04masserNF-PP1
Start=123/19, B1=25000000, B2=1775000000
2024-02-04masserNF-PP1
Start=6/5, B1=25000000, B2=1775000000
2024-02-03Wentao HuangC-PRP
M66617/405486947268483055319684033/111772744811205849236231671 : 2A12C55332D73CBA
PRP: Verified
PRP without proof (small exponent)
2024-02-01masserNF-PP1
Start=2/7, B1=25000000, B2=1775000000
2022-10-14George WoltmanNF-PM1
B1=1000000000, B2=92454784812390
2022-10-07George WoltmanNF-PM1
B1=1000000000
2020-04-17Oliver KruseC-PRP
M66617/111772744811205849236231671/405486947268483055319684033 : 2A12C55332D73CBA
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M66617/111772744811205849236231671/405486947268483055319684033 : 60BA5FFD00A89290
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M66617/111772744811205849236231671/405486947268483055319684033 : 60BA5FFD00A89290
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M66617/known_factors : 60BA5FFD00A89290
PRP without proof (not generated)
2016-12-09TJAOIF-ECM
Factor: 111772744811205849236231671
2016-11-02kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12