is 2 1595983 - 1
has 480439 decimal digits
takes 0.071 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L899106B52F1D3F6Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26718.617968.6567%500000150000000.08354.9856%18.701570.2194%
Target2610.192565.5738%6500600000.00061.0557%0.193165.9372%
Difference+6+18.4255+3.0829%+493500+14940000+0.0829+3.9299%+18.5084+4.2821%

Known prime factors (1 factor, 73.2 bits, 0.00458465% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1595983106276992549399458201112373.1703329515181220585
3 × 5 × 72 × 227303 × 19929137
2013-11-28227303199291371,770.60.08420.1313

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-04James HeinrichWHS850001445000---0.010--2.278%
2013-11-28David Campeaui5-2500k500000150000002373.1700.0840.1430.1674.986%
2016-03-16alpertronManual testing5000001500000012---0.084--4.986%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-29ANONYMOUSv4_computers21257--0.012--
2003-07-30ANONYMOUSv4_computers21258--0.024--
2010-05-03Architects Cubedm1_76l260261--0.096--
2010-07-04GrunwalderGIMPManual testing21263--1.000--


ECM factoring results:
Total ECM effort:31.353 GHz-days
Estimated T-Level:25.718
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025114.07
250000400000005017.28


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-01-01The Grebelius Family899106B52F1D3F6B0.071
1998-11-07ANONYMOUSv4_computers899106B52F1D3F6B0.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02Oliver KruseGTX-3
10627699254939945820111
37FD61DC172C7B__no
2017-10-31ATHec2-1xf
10627699254939945820111
37FD61DC172C7B__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 85000, B2 = 1445000 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
263
261
258
257
this exponent TF target: 61
TF double-checked to: 67.7
ECM T-Level=25.72 ~= 69-bit
250
260
270
280
Last modified: 2023-03-25T13:08:14+00:00