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

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MnDetails
18553
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
1183113921059387213705534348127098561264072983503388153173.02023-08-07 07:55:02
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000009476 / 16550
Estimated T-Level: 47.9 ⓘ
TF below 2^154 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
FactoredUnknown55CE0Unknown,(aka U)
FactoredGeorge Woltman8CEDDDDF5F9755CE0Woltman,Prime95,first web release,(aka W4)
FactoredBrian J. Beesley8CEDDDDF5F9755CE0Mac,John Sweeney,v1.4,(aka J3)
Factored2015-04-11MadPoo 🙂8CEDDDDF5F9755CE13170Windows 64-bit,Prime95,v26,(aka We4)
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
No proof (small exponent)
2023-08-09Ryan Propper91B91CCD7EB633C71178353
Verified
No proof (small exponent)
2023-08-09Naegi Makoto91B91CCD7EB633C71495753
History
DateUserTypeResult
2023-08-09Naegi MakotoC-PRPM18553/11831139210593872137055343481270985612640729835033881 : 91B91CCD7EB633C7
2023-08-09Ryan PropperC-PRPM18553/11831139210593872137055343481270985612640729835033881 : 91B91CCD7EB633C7
2023-08-07Ryan PropperF-ECMFactor: 11831139210593872137055343481270985612640729835033881 / ECM curve 3, B1=260000000, B2=3144535624230, Montgomery Sigma=6070363345188035
2023-07-08masserNF-PP1Start=105/17, B1=410000000, B2=16400000000
2022-05-13-anonymous-NF-PM1B1=100000000000, B2=80107051974399450
2022-04-24Ruslan BorisovNFno factor TF: 65-66
2021-05-12ATHNF-PP1Start=2/7, B1=1000000000, B2=241000000000
2021-02-19Ruslan BorisovNFno factor TF: 64-65
2018-10-16James HintzNF-PM1B1=34612878619, B2=2630578775044, E=12
2018-07-08snme2pm1NFno factor TF: 63-64
2016-12-24James HintzNF-PM1B1=1831776313, B2=113570131406, E=12
2016-08-03Sid & AndyNFno factor TF: 62-63
2016-02-23LaurVNFno factor TF: 57-58
2015-09-10snme2pm1NFno factor TF: 61-62
2015-04-11MadPoo 🙂C-LL8CEDDDDF5F9755CE
2015-03-22JayderNF-PM1B1=1172220000, B2=35360118869, E=12
2013-11-17David CampeauNF-PM1B1=1172220000
2013-11-13David CampeauNF-PM1B1=937775000
2013-10-29David CampeauNF-PM1B1=703330000
2013-10-22David CampeauNF-PM1B1=468885000
2013-10-17David CampeauNF-PM1B1=234445000
2012-12-25bcp19NFno factor TF: 60-61
2010-06-14chalsallNFno factor TF: 59-60
2010-06-14chalsallNFno factor TF: 58-59
2003-09-29-anonymous-NF-PM1B1=8388608, B2=838860800, E=12
2003-09-29-anonymous-NF-PM1B1=16777216, B2=1677721600, E=12
2003-07-06-anonymous-NF-PM1B1=4194304, B2=419430400, E=12
2003-05-19-anonymous-NF-PM1B1=2097152, B2=209715200, E=12
2003-04-27-anonymous-NF-PM1B1=1048576, B2=104857600, E=48
2003-04-03-anonymous-NF-PM1B1=524288, B2=52428800, E=48
2003-03-27-anonymous-NF-PM1B1=262144, B2=26214400, E=30
2003-02-02-anonymous-NF-PM1B1=131072, B2=13107200, E=30
2002-10-19-anonymous-NFno factor TF: 1-57
2002-07-14-anonymous-NF-PM1B1=65536, B2=6553600, E=12
2002-06-09-anonymous-NF-PM1B1=32768, B2=3276800
2002-04-28-anonymous-NF-PM1B1=16384, B2=1638400
2001-08-18Alex KruppaNF-PM1B1=1000000, B2=100000000
2001-07-29Alex KruppaNF-PM1B1=1000000, B2=100000000
2001-04-29-anonymous-NF-PM1B1=100000, B2=10000000
2000-09-29-anonymous-NFno factor TF: 1-56
2000-03-08-anonymous-NFno factor TF: 53-54
1999-10-15-anonymous-NFno factor TF: 52-53