is 2 15143287 - 1
has 4558584 decimal digits
takes 7.595 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA55A0706E29B0931double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual273126.316367.1233 %48000045434235018.33146.2227 %144.647769.1691 %
Target2697.883865.2174 %100000130000000.58382.9975 %8.467666.2600 %
Difference+4+118.4325+1.9059 %+380000+441342350+17.7476+3.2252%+136.1801+2.9091 %

Known prime factors (1 factor, 121.1 bits, 0.00079987% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15143287290187542519211915204487706464967878337121.12695813921547947917517672255193
32 × 11 × 23 × 79 × 1093 × 6091 × 135101 × 720617 × 821801
2022-11-027206178218011.154e+100.52811.0665

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-03-16ANONYMOUSv4_computers225000225000--0.1641.518%
2002-08-17ANONYMOUSv4_computers1700002167500--0.2033.136%
2023-10-22nordisweet16_30.8b14480000480000--0.3332.128%
2023-11-04nordisweet16_30.8b14480000454342350--20.818.854%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-11-02ATHec2-P_11000000100000027P-137121.1261.105


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-12-31Net_Forcev4_computers212580.004
2001-04-08ANONYMOUSv4_computers212650.247
2016-03-16Mark RoseManual testing265266
2014-05-14NesowaManual testing2662670.987
2017-12-24ramgeisManual testing2672695.922
2021-06-30lycornManual testing2692707.896
2021-08-25ChuckGPU72_TF27027115.79
2021-09-16Dylan DelgadoGPU72_TF27127231.58
2021-12-01Dylan DelgadoGPU72_TF27227363.16


ECM factoring results:
Total ECM effort:0.728 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.728


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-10-19ANONYMOUSv4_computersA55A0706E29B09317.595
2006-10-24ANONYMOUSv4_computersA55A0706E29B09317.595


PRP results:
dateuseridcompidcofactorsres64
2022-11-09Naegi Makoto1700
2901875425192119152044877064649678783
F6B1677943CFB08F


CERT results:
dateuseridcompid
2022-11-09curtiscwcm201--17l


P-1 factor-bounds graph:
B1 = 480000, B2 = 454342350 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 480000 (P-1 stage 1)
B1 = 170000, B2 = 2167500 (P-1 stage 2)
B1 = 225000 (P-1 stage 1)
B1 = 170000 (P-1 stage 1)
104
105
106
104
105
106
107
108
109
TF factor-bounds graph:
273
272
271
270
269
267
266
265
258
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
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Last modified: 2024-03-13T02:15:48+00:00