is 2 15035861 - 1
has 4526246 decimal digits
takes 7.201 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF6FEB04EA5C2FCE8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual273127.218867.1233 %20000006630804180252.171210.2306 %379.390070.4868 %
Target2697.940165.2174 %100000130000000.55752.9944 %8.497666.2589 %
Difference+4+119.2787+1.9059 %+1900000+6617804180+251.6137+7.2362%+370.8924+4.2279 %

Known prime factors:
No known factors for M15035861

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-03-03Architects Cubedv4_computers1700002125000--0.1923.118%
2020-09-10ThaZ-17015000003000000012--2.1206.768%
2022-03-22Luminescence5950X20000006630804180--320.313.609%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-04-07ATHec2-P_110000002900000027--2.094


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-12-31Net_Forcev4_computers212570.001
2001-01-08ANONYMOUSv4_computers212650.248
2014-06-11NesowaManual testing2652671.491
2015-12-17mikrManual testing2672681.988
2017-10-01ramgeisManual testing2682693.976
2020-06-30YxinityManual testing2692707.952
2021-09-02SRBaseManual testing27027115.90
2021-10-10ANONYMOUSManual testing27127231.81
2023-06-26Naegi MakotoManual testing27227363.62


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)
2002-05-05Architects Cubedv4_computersF6FEB04EA5C2FCE87.201
2005-12-12WileECoyotev4_computersF6FEB04EA5C2FCE87.201


PRP results:
No PRP results for M15035861


CERT results:
No CERT results for M15035861


P-1 factor-bounds graph:
B1 = 2000000, B2 = 6630804180 (P-1 stage 2)
B1 = 1500000, B2 = 30000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1500000 (P-1 stage 1)
B1 = 170000, B2 = 2125000 (P-1 stage 2)
B1 = 170000 (P-1 stage 1)
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105
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107
104
105
106
107
108
109
1010
TF factor-bounds graph:
273
272
271
270
269
268
267
265
257
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