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

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Exponent Range:










MnStatusDetails
1721Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
175543617.4old
14870782391030.5old
61600409128100132391382632582.3old
1301742488780560541374822764061964723154957773449750163.22012-02-03 16:45:46
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
6580000000080817 / 194238
Estimated T-Level: 62.1
TF below 2^201 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseBDDC50137870CFD84013
Verified2017-10-02kkmrkkblmbrbkBDDC50137870CFD84013
Verified2017-12-07ATHBDDC50137870CFD8439813
Verified2020-04-17Oliver Kruse12F73375845999F6421553
Verified2020-08-12_p95holder_12F73375845999F64112653
History
DateUserTypeResult
2022-08-29mikrNF-PM1
B1=400000000000, B2=1310778031989756330
2021-07-23ViliamFNF-PP1
Start=2/7, B1=1000000000, B2=221000000000
2020-08-12_p95holder_C-PRP
M1721/175543/1487078239/6160040912810013239138263/13017424887805605413748227640619647231549577734497 : 12F73375845999F6
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M1721/175543/1487078239/6160040912810013239138263/13017424887805605413748227640619647231549577734497 : 12F73375845999F6
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M1721/175543/1487078239/6160040912810013239138263/13017424887805605413748227640619647231549577734497 : BDDC50137870CFD8
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M1721/175543/1487078239/6160040912810013239138263/13017424887805605413748227640619647231549577734497 : BDDC50137870CFD8
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M1721/known_factors : BDDC50137870CFD8
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=1000000000, B2=100000000000, E=12
2012-02-03Michael KennF-ECM
Factor: 13017424887805605413748227640619647231549577734497