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

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MnStatusDetails
1785001Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
4010110702595992006964092478.4old
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ed Knapton372F2E2503AE92470
Verified (Factored)Andre de Boer372F2E2503AE92470
Verified (Factored)Harvey Miller372F2E2503AE92470
Verified (Factored)1999-02-21Jon Wilson372F2E2503AE9247690267
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel36F3FAF173AAEE2A013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-03Oliver Kruse5CF2DAD168C0B30E1013
Verified2017-11-05Chang Chia-Tche5CF2DAD168C0B30E1103840313
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
36F3FAF173AAEE2A
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-05Chang Chia-TcheC-PRP
M1785001/401011070259599200696409 : 5CF2DAD168C0B30E
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1785001/401011070259599200696409 : 5CF2DAD168C0B30E
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12