is 2 1595057 - 1
has 480161 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-L4DA556214B6D6629double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26718.628768.6567%500000150000000.08354.9853%18.712370.2193%
Target2610.192665.5738%6500600000.00061.0556%0.193265.9372%
Difference+6+18.4362+3.0829%+493500+14940000+0.0829+3.9297%+18.5191+4.2821%

Known prime factors (1 factor, 90.0 bits, 0.00564330% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
159505712498243478881554984203749112890.014391780465490623688815
5 × 7 × 31 × 173 × 929 × 829831 × 2707457
2013-12-048298312707457291,773,4000.06040.1094

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-04James HeinrichWHS850001445000---0.010--2.278%
2013-12-04David Campeaui5-2500k500000150000002890.0140.0840.1420.1674.985%
2016-03-17alpertronManual testing5000001500000012---0.084--4.985%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-29ANONYMOUSv4_computers21257--0.012--
2003-07-30ANONYMOUSv4_computers21258--0.024--
2010-05-02Architects Cubedm1_76l260261--0.096--
2010-06-29GrunwalderGIMPManual testing21263--1.001--


ECM factoring results:
Total ECM effort:31.350 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 Family4DA556214B6D66290.071
1998-11-21ANONYMOUSv4_computers4DA556214B6D66290.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02Oliver KruseGTX-2
1249824347888155498420374911
5A35AB43891AEB__no
2017-10-31ATHec2-1xf
1249824347888155498420374911
5A35AB43891AEB__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: 67.8
ECM T-Level=25.72 ~= 69-bit
250
260
270
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290
2100
Last modified: 2023-04-26T21:34:10+00:00