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

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MnStatusDetails
16651Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
139368871927.1old
38798495111031.92008-08-26 19:58:48
2645832839390821644012167.82008-10-16 23:57:26
64069820463607585954572272.42009-04-06 12:40:14
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001333 / 9201
Estimated T-Level: 40.7
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse6134923FC4B179104013
Verified2017-10-02kkmrkkblmbrbk6134923FC4B179104013
Verified2017-12-07ATH6134923FC4B1791041405313
Verified2020-04-17Oliver Kruse62B4592EA1FD34EC4423253
Verified2024-07-01kkmrkkblmbrbk62B4592EA1FD34EC4369753
History
DateUserTypeResult
2024-12-29masserNF-PP1
Start=6/5, B1=180000000, B2=179820000000
2024-12-24masserNF-PP1
Start=2/7, B1=180000000, B2=179820000000
2024-12-23masserNF-PP1
Start=188/41, B1=180000000, B2=179820000000
2024-10-26-Anonymous-NF-PM1
B1=100000000000, B2=120420153999155010
2024-07-01kkmrkkblmbrbkC-PRP
M16651/139368871/264583283939082164401/3879849511/6406982046360758595457 : 62B4592EA1FD34EC
PRP: Verified
PRP without proof (small exponent)
2023-05-25JacobZNF-PM1
B1=6400000000, B2=21797983496949660
2023-02-12USAFSSNF-PM1
B1=60000000, B2=4543108760190
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-17Oliver KruseC-PRP
M16651/139368871/3879849511/264583283939082164401/6406982046360758595457 : 62B4592EA1FD34EC
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M16651/139368871/3879849511/264583283939082164401/6406982046360758595457 : 6134923FC4B17910
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M16651/139368871/3879849511/264583283939082164401/6406982046360758595457 : 6134923FC4B17910
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M16651/known_factors : 6134923FC4B17910
PRP: Verified
PRP without proof (not generated)
2009-04-06Matthias WurtingerF-ECM
Factor: 6406982046360758595457
2008-10-16-Anonymous-F-ECM
Factor: 264583283939082164401
2008-08-26-Anonymous-F
Factor: 3879849511