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

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MnStatusDetails
847871Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
320495239928.3old
107612623934749391112063.22016-01-15 14:50:58
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-28Oliver Kruse6B2C52DD17DE38AA2013
Verified2017-10-14Oliver Kruse6B2C52DD17DE38AA263793913
Verified2017-12-18ATH6B2C52DD17DE38AA277977713
Verified2020-04-22Oliver Kruse7944D645B92314F1222254353
Verified2025-05-01kkmrkkblmbrbk7944D645B92314F1228030253
History
DateUserTypeResult
2025-05-01Jeremy PriceCERT
PRP Certification
Proof certified good
2025-05-01kkmrkkblmbrbkC-PRP
M847871/320495239/10761262393474939111 : 7944D645B92314F1
PRP proof power = 6
PRP: Verified
Proof certified good
2024-09-29timc995NF-PM1
B1=1000000, B2=45147432330
2020-04-22Oliver KruseC-PRP
M847871/320495239/10761262393474939111 : 7944D645B92314F1
PRP: Verified
PRP without proof (small exponent)
2017-12-18ATHC-PRP
M847871/320495239/10761262393474939111 : 6B2C52DD17DE38AA
PRP: Verified
PRP without proof (small exponent)
2017-10-14Oliver KruseC-PRP
M847871/320495239/10761262393474939111 : 6B2C52DD17DE38AA
PRP: Verified
PRP without proof (small exponent)
2017-09-28Oliver KruseC-PRP
M847871/320495239/10761262393474939111 : 6B2C52DD17DE38AA
PRP: Verified
PRP without proof (not generated)
2016-01-15TJAOIF-ECM
Factor: 10761262393474939111 / (ECM curve 15, B1=50000, B2=5000000)