Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnDetails
2261603
Composite, with 4 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 262
Factored
FactorDigitsBitsDate
54278473825.7old
92816187131033.12008-07-14 20:22:29
1327696657191237.02008-07-14 20:22:29
9361046209371239.82008-07-14 20:22:29
ECM
DigitsB1Curves
2550000280 / 280
30250000188 / 640
Estimated T-Level: 26.5 ⓘ
TF below 2^83 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
PRP without proof (not generated)
2017-10-10Oliver Kruse3626A824BD9DFA4E1013
Verified
PRP without proof (not generated)
2017-10-18Oliver KruseBD72A02B4C1DF92B478471353
Verified
PRP without proof (not generated)
2017-11-21storm5510BD72A02B4C1DF92B436953653
History
DateUserTypeResult
2017-11-21storm5510C-PRPM2261603/54278473/132769665719/9281618713/936104620937 : BD72A02B4C1DF92B
2017-10-18Oliver KruseC-PRPM2261603/54278473/132769665719/9281618713/936104620937 : BD72A02B4C1DF92B
2017-10-10Oliver KruseC-PRPM2261603/known_factors : 3626A824BD9DFA4E
2016-04-17alpertronNF-PM1B1=500000, B2=15000000, E=12
2008-07-14George WoltmanF-ECMFactor: 936104620937
2008-07-14George WoltmanF-ECMFactor: 9281618713
2008-07-14George WoltmanF-ECMFactor: 132769665719