is 2 1717151 - 1
has 516914 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L365DFE9072680331double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual271278.413770.4225 %17000000256271815800953.899516.2873 %1,232.313175.2399 %
Target2610.178965.5738 %70005500000.00251.3432 %0.181466.0362 %
Difference+10+278.2348+4.8488 %+16993000+256271265800+953.8970+14.9441%+1,232.1318+9.2037 %

Known prime factors:
No known factors for M1717151

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-02-07Carsten Kossendeymother9000015075006--0.0114.723%
2014-04-01JossManual testing100000100000--0.0082.015%
2014-05-03JossManual testing150000150000--0.0122.427%
2014-10-05JossManual testing187378187378--0.0152.671%
2015-01-09JossManual testing281067281067--0.0223.150%
2015-02-03JossManual testing309173309173--0.0243.268%
2015-02-16JossManual testing374099374099--0.0293.511%
2015-02-22JossManual testing411508411508--0.0323.637%
2015-03-06JossManual testing452658452658--0.0363.764%
2015-03-14JossManual testing497923497923--0.0393.893%
2015-04-08JossManual testing602486602486--0.0474.159%
2015-05-01JossManual testing729007729007--0.0574.433%
2015-05-07JossManual testing801907801907--0.0634.574%
2015-05-22JossManual testing882097882097--0.0694.716%
2015-05-26JossManual testing970306970306--0.0764.861%
2015-06-08JossManual testing10673361067336--0.0845.007%
2015-06-25JossManual testing11740691174069--0.0925.156%
2015-07-07JossManual testing12914751291475--0.1025.306%
2015-07-13JossManual testing14206221420622--0.1125.458%
2015-07-24JossManual testing15626841562684--0.1235.612%
2015-08-09mikrMSI364220012345678912--0.69413.482%
2018-08-21JossManual testing171715117171510012--0.86413.518%
2018-10-16JossManual testing171715118888661012--0.93713.672%
2023-01-04JossManual testing17171511253147280--5.79016.673%
2023-03-19JossManual testing17171513511235910--15.9818.260%
2023-06-19linamentU2K1700000017000000--1.1609.920%
2023-06-20linamentCyber17000000256271815800--1,33327.718%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-05-10Carlos PinhoHomeComputer10000005100000027--0.286
2021-06-07LaurVbutu500000036500000027--1.830


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-11-21ANONYMOUSv4_computers212570.011
2003-02-02ANONYMOUSv4_computers212580.022
2016-02-23Mark RoseManual testing2582600.067
2010-04-22Architects Cubeda3_bu22602610.089
2010-10-27GrunwalderGIMPManual testing212630.929
2016-02-23Mark RoseManual testing2612630.751
2015-05-02snme2pm1Manual testing2632653.319
2015-09-01ramgeisManual testing2652664.352
2018-05-28TJAOIManual testing2662678.704
2019-06-17TJAOIManual testing26726817.41
2021-05-30LaurVManual testing268270104.4
2021-06-09LaurVManual testing270271139.3


ECM factoring results:
Total ECM effort:27.102 GHz-days
Estimated T-Level:25.515
DigitsB1CompleteFacMiss
201100013.0690.000%
25500001.35625.774%
302500000.10390.214%
3510000000.00699.369%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028018.64
25000040000000238.459


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21ANONYMOUSv4_computers365DFE90726803310.081
2015-07-19MadPooManual testing365DFE90726803310.093


PRP results:
No PRP results for M1717151


CERT results:
No CERT results for M1717151


P-1 factor-bounds graph:
B1 = 17000000, B2 = 256271815800 (P-1 stage 2)
B1 = 1717151, B2 = 3511235910 (P-1 stage 2)
B1 = 1717151, B2 = 1253147280 (P-1 stage 2)
B1 = 17000000 (P-1 stage 1)
B1 = 1717151, B2 = 188886610 (P-1 stage 2)
B1 = 1717151, B2 = 171715100 (P-1 stage 2)
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1717151 (P-1 stage 1)
B1 = 1562684 (P-1 stage 1)
B1 = 1420622 (P-1 stage 1)
B1 = 1291475 (P-1 stage 1)
B1 = 1174069 (P-1 stage 1)
B1 = 1067336 (P-1 stage 1)
B1 = 970306 (P-1 stage 1)
B1 = 882097 (P-1 stage 1)
B1 = 801907 (P-1 stage 1)
B1 = 729007 (P-1 stage 1)
B1 = 602486 (P-1 stage 1)
B1 = 497923 (P-1 stage 1)
B1 = 452658 (P-1 stage 1)
B1 = 411508 (P-1 stage 1)
B1 = 374099 (P-1 stage 1)
B1 = 309173 (P-1 stage 1)
B1 = 281067 (P-1 stage 1)
B1 = 187378 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.51 ~= 68-bit
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Last modified: 2024-03-13T02:15:48+00:00