is 2 3937337 - 1
has 1185257 decimal digits
takes 0.491 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L28CFABA43D5019F7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2677.546767.1642 %10000001198606501.35208.3545 %8.898769.9074 %
Target2640.904065.6250 %2600025000000.02912.2817 %0.933166.4093 %
Difference+3+6.6427+1.5392 %+974000+117360650+1.3229+6.0728%+7.9656+3.4981 %

Known prime factors (2 factors, 131.5 bits, 0.00333888% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3937337246607207589503253692064.4193131649736732
22 × 11 × 17 × 79 × 149 × 355679
2011-09-281493556791.24740.00350.0065
39373371521723427942601387512167.04419324272064375
54 × 53 × 583374251
2021-07-076255833742518.13005.748110.736

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-08-01Carsten Kossendeymother20000285000--0.0061.835%
2011-09-28Squeeky_SquirrelT7500_22002064.4190.0240.000%
2022-05-15JossManual testing500000119860650
skipped known factor: 24660720758950325369
--1.26610.013%
2022-09-27JossManual testing1000000119860650
skipped known factor: 24660720758950325369
--1.35210.682%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-01-05t_ludersv4_computers212600.020
2009-01-01Architects Cubedm1_tt2602610.039
2011-03-10Grant McCrackenthumper2612620.078
2022-07-12Wentao HuangManual testing262265
64.419
20
2022-07-12LordJuliusManual testing262267
skipped known factors(?)
2021-07-07TJAOIManual testing267268*
67.044
21
0.336


ECM factoring results:
Total ECM effort:0.355 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.355


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-04-15Scott Kurowskiv4_computers28CFABA43D5019F70.491
1999-12-30Daniel Hermlev4_computers28CFABA43D5019F70.491


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
24660720758950325369
58525AA0B4BFDF03
2017-12-31Oliver KruseGTX-7
24660720758950325369
58525AA0B4BFDF03
2021-07-09tottenhoff2018pc
24660720758950325369
152172342794260138751
1B292BA6B998BB35


CERT results:
dateuseridcompid
2021-07-09curtiscwd-210--00l


P-1 factor-bounds graph:
B1 = 1000000, B2 = 119860650 (P-1 stage 2)
B1 = 500000, B2 = 119860650 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 20000, B2 = 285000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
265
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00