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

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Exponent Range:










MnStatusDetails
1873Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
2297515335887208173468892477.6old
522940274704518414099376092736796881964341691500949161.82012-03-01 12:57:08
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
6580000000066683 / 194238
Estimated T-Level: 61.7
TF below 2^200 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse9E8D282785C2528C2013
Verified2017-10-02kkmrkkblmbrbk9E8D282785C2528C2013
Verified2017-12-07ATH9E8D282785C2528C2186313
Verified2020-04-17Oliver Kruse2DE9BCD053554226287253
Verified2020-08-12_p95holder_2DE9BCD053554226287153
History
DateUserTypeResult
2022-11-21mikrNF-PM1
B1=400000000000, B2=2574610952249956620
2021-07-25ViliamFNF-PP1
Start=2/7, B1=1000000000, B2=221000000000
2020-08-12_p95holder_C-PRP
M1873/229751533588720817346889/5229402747045184140993760927367968819643416915009 : 2DE9BCD053554226
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M1873/229751533588720817346889/5229402747045184140993760927367968819643416915009 : 2DE9BCD053554226
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M1873/229751533588720817346889/5229402747045184140993760927367968819643416915009 : 9E8D282785C2528C
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M1873/229751533588720817346889/5229402747045184140993760927367968819643416915009 : 9E8D282785C2528C
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M1873/known_factors : 9E8D282785C2528C
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=1000000000, B2=100000000000, E=12
2012-03-01Michael KennF-ECM
Factor: 5229402747045184140993760927367968819643416915009