is 2 1804961 - 1
has 543348 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L031203BB550B54FFdouble-checked
PRPF467F003B977BF__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.022869.1176%49336301924115701.19168.7361%34.214471.8156%2.6979%
PrimeNet2570.010663.1579%80001500000.00122.8716%0.011964.2159%1.0580%
GPU722610.170265.5738%90001300000.00121.5552%0.171466.1092%0.5354%
Difference+7+32.8526+3.5439%+4924630+192281570+1.1903+7.1809%+34.0430+5.7064%+5.7064%

Known prime factors (1 factor, 87.3 bits, 0.00483567% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18049611881367042898813038160026572787.28252116556615317811248
24 × 3 × 1085761596152454401
2021-01-2516108576159615245440122,055,6614.653e+98.691e+9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers25000387500---0.004--1.036%
2011-02-07T12:39:00Carsten Kossendeyleela1000001650000---0.015--2.197%
2014-05-12T10:21:00Jocelyn LaroucheManual testing135560135560---0.011--0.924%
2014-07-22T20:20:00mikrMSI4933630192411570---1.192--8.736%
2018-11-13T13:00:04Jocelyn LaroucheManual testing180496119854571012---0.985--8.080%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:52Mark RoseManual testing258260--0.064--
2010-04-13T12:48:00Architects Cubedm1_tt260261--0.085--
2016-02-23T16:28:52Mark RoseManual testing261262--0.170--
2010-12-13T03:33:00GrunwalderGIMPManual testing21263--0.884--
2016-02-23T16:28:52Mark RoseManual testing262263--0.544--
2015-04-20T21:14:00snme2pm1Manual testing263264--1.088--
2015-04-20T21:14:00snme2pm1Manual testing264265--2.070--
2015-09-01T08:49:00ramgeisManual testing265266--4.140--
2018-05-21T16:49:47TJAOIManual testing266267--8.280--
2019-07-15T09:27:29TJAOIManual testing267268--16.56--


ECM factoring results:

Old Calculation Method

Total ECM effort:16.068 GHz-days
Estimated T-Level:24.161
DigitsB1CurvesCompleteFacMiss
2011000233 / 1002.3309.616%
2550000233 / 2800.83243.447%

New Calculation Method

Total ECM effort:16.068 GHz-days
Estimated T-Level:24.161
DigitsB1CompleteFacMiss
20110007.5160.054%
25500000.67950.697%
302500000.04295.903%
3510000000.00299.809%


ECM Summary

B1B2factorcurvesGHz-days
50000500000023015.86
50000500000030.207


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers031203BB550B54FF0.098
2015-07-10T01:00:00MadPooManual testing031203BB550B54FF0.098


PRP results:
dateuseridcompidcofactorsres64PRP
2021-01-25T23:35:42MarkSdesktop-i7
188136704289881303816002657
F467F003B977BF__no


P-1 factor-bounds graph:
B1 = 4933630, B2 = 192411570 (P-1 stage 2)
B1 = 1804961, B2 = 198545710 (P-1 stage 2)
B1 = 4933630 (P-1 stage 1)
B1 = 1804961 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 135560 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-01-29T12:55:31+00:00