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
2028461Factored
FactorDigitsBitsDate
917682085198331446.4old
2458410278234578648492167.72021-05-31 02:18:26
ECM
DigitsB1Curves
2550000280 / 280
30250000112 / 640
Estimated T-Level: 25.9 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-06Oliver KruseD4948CDA1B1A2F8E1013
Verified (Factored)2017-11-14kkmrkkblmbrbkD4948CDA1B1A2F8E1160592213
Verified2021-06-01M890938781F1E528441AC753230762753
History
DateUserTypeResult
2021-06-01AmorTenderlyCERT
PRP Certification
Proof certified good
2021-06-01M8909387C-PRP
M2028461/91768208519833/245841027823457864849 : 81F1E528441AC753
PRP proof power = 7
PRP: Verified
Proof certified good
2021-05-31_p95holder_F-ECM
Factor: 245841027823457864849 / (ECM curve 6, B1=50000, B2=5000000)
2017-11-14kkmrkkblmbrbkC-PRP
M2028461/91768208519833 : D4948CDA1B1A2F8E
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-06Oliver KruseC-PRP
M2028461/91768208519833 : D4948CDA1B1A2F8E
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12