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

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MnStatusDetails
16553Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
185047591748587200251258203908138004564327593606348627844158190.22023-10-19 14:31:45
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000010126 / 40830
Estimated T-Level: 51.2
TF below 2^165 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Unknown6AAA0
Verified (Factored)George Woltman5396FD0D8AFC6AAA0
Verified (Factored)Brian J. Beesley5396FD0D8AFC6AAA0
Verified (Factored)2015-04-11MadPoo5396FD0D8AFC6AAA6569
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-10-19Anton Repko31B6D035ECC70A221529053
Verified2023-10-20Naegi Makoto31B6D035ECC70A221122953
P-1 factors
DateFactorB1B2
2023-10-19185047591748587200251258203908138004564327593606348627844110000000000001402034650733707008
History
DateUserTypeResult
2023-10-20Naegi MakotoC-PRP
M16553/1850475917485872002512582039081380045643275936063486278441 : 31B6D035ECC70A22
PRP: Verified
PRP without proof (small exponent)
2023-10-19Anton RepkoC-PRP
M16553/1850475917485872002512582039081380045643275936063486278441 : 31B6D035ECC70A22
PRP: Verified
PRP without proof (small exponent)
2023-10-19Anton RepkoF-PM1
Factor: 1850475917485872002512582039081380045643275936063486278441 / (P-1, B1=1000000000000, B2=1402034650733706990)
2023-08-26masserNF-PP1
Start=6/5, B1=460000000, B2=82340000000
2023-07-08masserNF-PP1
Start=187/61, B1=460000000, B2=18400000000
2022-04-23-Anonymous-NF-PM1
B1=100000000000, B2=100609955472526500
2022-01-16Ruslan BorisovNF
no factor from 2^65 to 2^66
2021-05-10ATHNF-PP1
Start=2/7, B1=1000000000, B2=241000000000
2021-02-11Ruslan BorisovNF
no factor from 2^64 to 2^65
2018-10-30snme2pm1NF
no factor from 2^63 to 2^64
2016-09-16BloodIceNF-PM1
B1=100000000000, B2=5000000000000, E=12
2016-09-07BloodIceNF-PM1
B1=100000000000
2016-08-23BloodIceNF-PM1
B1=50000000000
2016-06-19Sid & AndyNF
no factor from 2^62 to 2^63
2016-06-08Sid & AndyNF
no factor from 2^62 to 2^63
2016-05-03JossNF-PM1
B1=992344772, B2=49617238600, E=12
2016-02-23LaurVNF
no factor from 2^57 to 2^58
2016-02-23LaurVNF
no factor from 2^58 to 2^59
2016-02-23LaurVNF
no factor from 2^59 to 2^60
2015-08-28snme2pm1NF
no factor from 2^61 to 2^62
2015-04-11MadPooC-LL
5396FD0D8AFC6AAA
2012-12-25bcp19NF
no factor from 2^60 to 2^61
2012-10-12JossNF-PM1
B1=496172386, B2=49617238600, E=12
2010-03-17GrunwalderGIMPNF
no factor from 2^1 to 2^60