is 2 1712981 - 1
has 515659 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LBA2406DC100A2EBEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26717.346368.6567 %500000150000000.08805.0284 %17.434470.2328 %
Target2610.179365.5738 %70005500000.00251.3425 %0.181866.0359 %
Difference+6+17.1670+3.0829 %+493000+14450000+0.0855+3.6859%+17.2525+4.1968 %

Known prime factors (2 factors, 139.3 bits, 0.00812973% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
171298191402008393613807031962.9872667922422771
3 × 23 × 21017 × 1839727
2010-10-162101718397270.86360.00820.0128
1712981913463346873991647406572376.27426662973695388088
23 × 3 × 997 × 1114300137721
2020-04-06997111430013772110,5354,142.97,737.8

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 9140200839361380703
---8.802%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-02-02ANONYMOUSv4_computers212580.022
2022-03-08LordJuliusManual testing21260
2010-04-23Architects Cubeda3_bu22602610.090


ECM factoring results:
Total ECM effort:35.283 GHz-days
Estimated T-Level:25.709
DigitsB1CompleteFacMiss
201100014.9310.000%
25500001.68118.619%
302500000.14286.785%
3510000000.01099.033%


ECM Summary

B1B2factorcurvesGHz-days
10.052
50000500000025617.27
500005000000100.686
250000400000004717.28


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28ANONYMOUSv4_computersBA2406DC100A2EBE0.081


PRP results:
dateuseridcompidcofactorsres64
2017-09-30alpertronManual testing
9140200839361380703
2728FED6D8EE48F5
2017-10-18Oliver KruseThreadripper-PC
9140200839361380703
2728FED6D8EE48F5
2020-04-07mnd9mnd
9140200839361380703
91346334687399164740657
F2E82B702AAD6F66
2020-04-08Sébastien BROUCKEPortable_Seb
9140200839361380703
91346334687399164740657
F2E82B702AAD6F66


CERT results:
No CERT results for M1712981


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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102
103
104
105
106
101
102
103
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105
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107
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109
1010
1011
1012
1013
TF factor-bounds graph:
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00