is 2 1596667 - 1
has 480645 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-L351C7431F4DF5B07double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26718.610068.6567%500000150000000.08354.9859%18.693570.2195%
Target2610.192465.5738%6500600000.00061.0558%0.193065.9373%
Difference+6+18.4176+3.0829%+493500+14940000+0.0829+3.9300%+18.5005+4.2822%

Known prime factors (1 factor, 92.0 bits, 0.00576196% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
159666749491758103891068484810919512891.9991549845963619560887925
3 × 52 × 1609 × 9463 × 97021 × 13988677
2013-11-289702113988677357,933,0470.05530.0922

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-04James HeinrichWHS850001445000---0.010--2.278%
2013-11-28David Campeaui5-2500k500000150000002891.9990.0840.1430.1674.986%
2016-03-16alpertronManual testing5000001500000012-
skipped known factor: 4949175810389106848481091951
--0.084--4.986%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-14ANONYMOUSv4_computers21257--0.012--
2022-03-08LordJuliusManual testing257260--0.084--
2010-05-03Architects Cubedm1_76l260261--0.096--
2010-07-04GrunwalderGIMPManual testing21263--1.000--


ECM factoring results:
Total ECM effort:31.354 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)
1997-01-01Martin Fahlgren351C7431F4DF5B070.071
1998-12-06ANONYMOUSv4_computers351C7431F4DF5B070.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02Oliver KruseGTX-1
4949175810389106848481091951
85311F23FA1A4B__no
2017-10-31kkmrkkblmbrbkc4.xlarge
4949175810389106848481091951
85311F23FA1A4B__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
260
257
this exponent TF target: 61
TF double-checked to: 67.7
ECM T-Level=25.72 ~= 69-bit
250
260
270
280
290
2100
Last modified: 2023-03-25T13:08:14+00:00