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

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MnStatusDetails
1848863Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
502890737928.9old
443172461111135.42008-07-15 07:47:22
666611349206723762572065.92019-06-06 11:44:55
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel092255EAF205A356013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-04Oliver Kruse06C78175F90396102013
Verified (Factored)2017-11-07kkmrkkblmbrbk06C78175F90396102182220013
Verified2019-06-07Niels_Mache_Nextcloud092255EAF205A3563129542853
Verified2019-06-08kkmrkkblmbrbk092255EAF205A3563178373953
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
092255EAF205A356
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-04-12Lisander ViaeneNF-PM1
B1=500000, B2=2903586840
2019-06-08kkmrkkblmbrbkC-PRP
M1848863/502890737/44317246111/66661134920672376257 : 092255EAF205A356
PRP: Verified
PRP without proof (not generated)
2019-06-07Niels_Mache_NextcloudC-PRP
M1848863/502890737/44317246111/66661134920672376257 : 092255EAF205A356
PRP: Verified
PRP without proof (not generated)
2019-06-06TJAOIF
Factor: 66661134920672376257 / TF: 65-66
2017-11-07kkmrkkblmbrbkC-PRP
M1848863/502890737/44317246111 : 06C78175F9039610
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1848863/502890737/44317246111 : 06C78175F9039610
PRP: Verified
PRP without proof (not generated)
2008-07-15J FeitsmaF
Factor: 44317246111