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:










MnStatusDetails
268517Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
143925113927.1old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000222 / 1566
Estimated T-Level: 30.7
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver KruseE67ECF64A877634A1013
Verified2017-10-12Oliver KruseE67ECF64A877634A124530013
Verified2017-11-06kkmrkkblmbrbkE67ECF64A877634A111394713
Verified2020-04-17Oliver KruseE93047C7F644B52E114058253
Verified2024-08-02kkmrkkblmbrbkE93047C7F644B52E12190353
History
DateUserTypeResult
2024-10-23yuriy5-1NF-PM1
B1=24703564, B2=6040018914930
2024-08-02Mike_SchiesslCERT
PRP Certification
Proof certified good
2024-08-02kkmrkkblmbrbkC-PRP
M268517/143925113 : E93047C7F644B52E
PRP proof power = 5
PRP: Verified
Proof certified good
2022-03-20Lisander ViaeneNF-PM1
B1=5550000, B2=25042991610
2022-03-19Lisander ViaeneNF-PM1
B1=5550000
2022-01-03Lisander ViaeneNF-PM1
B1=100000
2020-04-17Oliver KruseC-PRP
M268517/143925113 : E93047C7F644B52E
PRP: Verified
PRP without proof (small exponent)
2017-11-06kkmrkkblmbrbkC-PRP
M268517/143925113 : E67ECF64A877634A
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M268517/143925113 : E67ECF64A877634A
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M268517/143925113 : E67ECF64A877634A
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M268517/143925113 : E67ECF64A877634A
PRP without proof (not generated)