Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
1871Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
14969513.9old
112667879926.7old
15005906471030.5old
14470884054894568344466372014431871136116.8old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
6580000000066395 / 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 Kruse496170D3D68927C74013
Verified2017-10-02kkmrkkblmbrbk496170D3D68927C74013
Verified2017-12-07ATH496170D3D68927C7469313
Verified2020-04-17Oliver Kruse3FADA07686925E234109153
Verified2020-08-12_p95holder_3FADA07686925E234103753
History
DateUserTypeResult
2022-11-16mikrNF-PM1
B1=400000000000, B2=2575888041040674360
2021-07-25ViliamFNF-PP1
Start=2/7, B1=1000000000, B2=221000000000
2020-08-12_p95holder_C-PRP
M1871/14969/112667879/1500590647/144708840548945683444663720144318711 : 3FADA07686925E23
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M1871/14969/112667879/1500590647/144708840548945683444663720144318711 : 3FADA07686925E23
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M1871/14969/112667879/1500590647/144708840548945683444663720144318711 : 496170D3D68927C7
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M1871/14969/112667879/1500590647/144708840548945683444663720144318711 : 496170D3D68927C7
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M1871/known_factors : 496170D3D68927C7
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=1000000000, B2=100000000000, E=12