is 2 15153503 - 1
has 4561659 decimal digits
takes 7.600 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC9A19F924878BF4Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual273126.231267.1233 %43000090000000.65233.2211 %126.883468.1823 %
Target2697.878565.2174 %100000130000000.58382.9978 %8.462366.2601 %
Difference+4+118.3527+1.9059 %+330000-4000000+0.0684+0.2233%+118.4211+1.9222 %

Known prime factors:
No known factors for M15153503

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-05-11Albyv4_computers145000688750--0.1272.256%
2018-05-09riccardo ubertiDuallie-2430000900000012--0.6234.807%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-11-22ATHec2-P_110000002900000027--2.193


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-12-31Net_Forcev4_computers212570.001
2000-12-31Net_Forcev4_computers212580.003
2002-05-11ITSv4_computers212650.247
2014-05-14NesowaManual testing2652660.493
2014-05-14NesowaManual testing2662670.986
2017-12-24ramgeisManual testing2672681.973
2017-12-24ramgeisManual testing2682693.945
2021-07-01lycornManual testing2692707.890
2021-09-03SRBaseManual testing27027115.78
2021-10-10ANONYMOUSManual testing27127231.56
2023-07-05Sid & AndyManual testing27227363.12


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)
2002-09-14Albyv4_computersC9A19F924878BF4A7.600
2005-09-22Team Prime Ribv4_computersC9A19F924878BF4A7.600


PRP results:
No PRP results for M15153503


CERT results:
No CERT results for M15153503


P-1 factor-bounds graph:
B1 = 430000, B2 = 9000000 (P-1 stage 2)
B1 = 430000 (P-1 stage 1)
B1 = 145000, B2 = 688750 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
104
105
106
104
105
106
107
TF factor-bounds graph:
273
272
271
270
269
268
267
266
265
258
257
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
250
260
270
280
JSON version of this page
Last modified: 2024-02-09T03:30:02+00:00