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

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MnStatusDetails
1748749Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1914530405211237.5old
317101888653320231754.82014-12-16 13:45:19
4455364962659791131858.62015-07-02 11:23:12
11016936624201994979482632579.92020-06-04 16:18:43
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.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-05Oliver Kruse394D58BD2E48A2193013
Verified (Factored)2017-11-10kkmrkkblmbrbk394D58BD2E48A219392699413
Verified2020-06-05mnd913E35E61FF45C7D3491971153
Verified2020-06-06Oliver Kruse13E35E61FF45C7D3421493853
P-1 factors
DateFactorB1B2
2015-07-0244553649626597911350000015000000
History
DateUserTypeResult
2020-06-06Oliver KruseC-PRP
M1748749/191453040521/31710188865332023/445536496265979113/1101693662420199497948263 : 13E35E61FF45C7D3
PRP: Verified
PRP without proof (not generated)
2020-06-05mnd9C-PRP
M1748749/191453040521/31710188865332023/445536496265979113/1101693662420199497948263 : 13E35E61FF45C7D3
PRP: Verified
PRP without proof (not generated)
2020-06-04_p95holder_F-ECM
Factor: 1101693662420199497948263 / (ECM curve 1, B1=50000, B2=5000000)
2017-11-10kkmrkkblmbrbkC-PRP
M1748749/191453040521/31710188865332023/445536496265979113 : 394D58BD2E48A219
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1748749/191453040521/31710188865332023/445536496265979113 : 394D58BD2E48A219
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1748749/191453040521/31710188865332023/445536496265979113 : 394D58BD2E48A219
PRP without proof (not generated)
2015-07-02alpertronF-PM1
Factor: 445536496265979113 / (P-1, B1=500000, B2=15000000, E=12)
2014-12-16TJAOIF
Factor: 31710188865332023 / TF: 54-55