is 2 6148603 - 1
has 1850914 decimal digits
takes 1.090 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC44F4AC0884F8BE6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272155.536768.0556%19937613267864605.05967.1207%160.596470.3302%2.2747%
PrimeNet2620.099962.9032%260006000000.01473.3430%0.114664.1434%1.2401%
GPU722662.401965.1515%400009000000.02232.4269%2.424265.9973%0.8458%
Difference+6+153.1348+2.9040%+1953761+325886460+5.0373+4.6938%+158.1721+4.3330%+4.3330%

Known prime factors:
No known factors for M6148603

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-06-14T21:44:00Carsten Kossendeyleela30000450000---0.014--0.809%
2013-03-02T18:36:00Squeeky_SquirrelT7500_22001150002242500---0.059--1.820%
2019-08-02T20:57:31takahashivaio6000001200000012---0.314--3.529%
2022-01-08T19:33:14LaurVZero81822036072203607---0.566--2.442%
2022-01-19T17:14:24LaurVZero8181993761326786460---5.060--7.121%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-20T00:00:00ANONYMOUSv4_computers21262--0.100--
2016-02-23T16:39:19Mark RoseManual testing262263--0.160--
2014-09-10T22:05:00NesowaManual testing263264--0.319--
2014-09-18T11:03:00monstManual testing264265--0.608--
2015-10-08T02:09:52Bruno VictalManual testing265266--1.215--
2016-04-08T22:48:57Gordon SpenceManual testing266267--2.431--
2018-05-30T12:53:28ramgeisManual testing267268--4.861--
2020-03-23T11:15:57takahashiManual testing268269--9.72--
2020-11-18T22:24:59takahashiManual testing269270--19.45--
2021-08-10T15:27:59SRBaseManual testing270271--38.89--
2021-10-15T18:20:04SRBaseManual testing271272--77.78--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.617 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:1.617 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.617


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computersC44F4AC0884F8BE61.090
2001-07-29T00:00:00lozcsv4_computersC44F4AC0884F8BE61.090


PRP results:
No PRP results for M6148603


P-1 factor-bounds graph:
B1 = 1993761, B2 = 326786460 (P-1 stage 2)
B1 = 2203607 (P-1 stage 1)
B1 = 1993761 (P-1 stage 1)
B1 = 600000, B2 = 12000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 115000, B2 = 2242500 (P-1 stage 2)
B1 = 115000 (P-1 stage 1)
B1 = 30000, B2 = 450000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-19T17:14:24+00:00