Marin Mersenne 2^P-1
Username
Password
Forgot password?
Black
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
1237
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
253820712984068779933520325949287047618624889661640134650002731179598370230.62010-11-02 15:07:02
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
65800000000109057 / 194238
Estimated T-Level: 62.8 ⓘ
TF below 2^204 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
FactoredUnknown5BE20Unknown,(aka U)
FactoredGeorge WoltmanDF5E6622F83F5BE20Woltman,Prime95,first web release,(aka W4)
FactoredGord PalametaDF5E6622F83F5BE2116Linux 32-bit,Prime95,v23,(aka WZ2)
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
No proof (small exponent)
2017-09-25csaba7F72EDA0088CF18E1013
Verified
No proof (small exponent)
2017-09-26George Woltman7F72EDA0088CF18E13713
Verified
No proof (small exponent)
2017-10-02kkmrkkblmbrbk7F72EDA0088CF18E1013
Verified
No proof (small exponent)
2020-04-17Oliver Kruse8E671C85179020B6193053
Verified
No proof (small exponent)
2020-08-12_p95holder_8E671C85179020B6115953
History
DateUserTypeResult
2025-09-14ViliamFNF-PP1Start=6/5, B1=50000000000, B2=5000000000000
2025-09-11ViliamFNF-PP1Start=2/7, B1=50000000000, B2=5000000000000
2021-07-19ViliamFNF-PP1Start=2/7, B1=1000000000, B2=221000000000
2021-03-27nordiNF-PM1B1=1000000000000, B2=2232843418649129478
2020-08-12_p95holder_C-PRPM1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 8E671C85179020B6
2020-04-17Oliver KruseC-PRPM1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 8E671C85179020B6
2017-10-02kkmrkkblmbrbkC-PRPM1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 7F72EDA0088CF18E
2017-09-26George WoltmanC-PRPM1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 7F72EDA0088CF18E
2017-09-25csabaC-PRPM1237/known_factors : 7F72EDA0088CF18E
2010-11-02-anonymous-F-ECMFactor: 2538207129840687799335203259492870476186248896616401346500027311795983
2010-06-22anonymousNFno factor TF: 59-60
2010-06-14chalsallNFno factor TF: 58-59
2008-10-22Markus TervoorenNF-PM1B1=45000000000, B2=4500000000000, E=12
2003-11-28-anonymous-NF-PM1B1=1000000, B2=100000000, E=12
2003-09-29-anonymous-NF-PM1B1=1000000, B2=100000000, E=12
2002-12-25-anonymous-NF-PM1B1=4290000000
2002-11-16JossNF-PM1B1=4294000000, B2=4294000000
2002-09-14-anonymous-NF-PM1B1=3221225472, B2=4290000000, E=48
2002-08-24-anonymous-NFno factor TF: 1-50
2002-07-27-anonymous-NF-PM1B1=2147483648, B2=4290000000, E=48
2002-07-20Alex KruppaNFno factor TF: 1-57
2002-05-25-anonymous-NF-PM1B1=1073741824, B2=4290000000
2001-05-13-anonymous-NF-PM1B1=3000000000, B2=4290000000
2001-02-11-anonymous-NF-PM1B1=10000, B2=1000000
2001-02-11-anonymous-NF-PM1B1=1000000, B2=100000000
2000-07-03-anonymous-NFno factor TF: 1-56
2000-01-19-anonymous-NFno factor TF: 54-55
1999-12-01-anonymous-NFno factor TF: 53-54
1998-07-29-anonymous-NFno factor TF: 51-53