is 2 1725593 - 1
has 519456 decimal digits
takes 0.094 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L64F69C4E0AF64BEDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.219568.6567%500000150000000.10155.0328%17.321070.2342%1.5774%
PrimeNet2570.011163.1579%80001400000.00122.7950%0.012364.1876%1.0297%
GPU722610.178065.5738%70001100000.00101.3446%0.179066.0367%0.4629%
Difference+6+17.0415+3.0829%+493000+14890000+0.1005+3.6882%+17.1420+4.1975%+4.1975%

Known prime factors (2 factors, 137.6 bits, 0.00797551% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17255934461276734090346043032168.596129267930911007
3 × 7 × 263 × 23405383109
2020-06-012632340538310960.840100.31187.35
17255936021918707707440664872169.029174488384796051
3 × 58162794932017
2008-07-0835816279493201779.849249,271465,569

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
172559326865445825278608043559720561539516829356142137.625
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:31:39alpertronManual testing5000001500000012---0.101--5.033%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.431 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:17.431 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110009.7690.006%
25500000.90440.498%
302500000.05794.458%
3510000000.00399.734%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000022015.10
500005000000342.333


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers64F69C4E0AF64BED0.094


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:16:06alpertronManual testing
602191870770744066487
8ACBE66AE660FC__no
2017-10-19T05:48:13Oliver KruseGTX-3
602191870770744066487
8ACBE66AE660FC__no
2020-06-02T08:31:06Klaus Nordmannno1
446127673409034604303
602191870770744066487
8C786BCFAD0C9994no
2020-06-03T06:52:20marssystemssystem03
446127673409034604303
602191870770744066487
8C786BCFAD0C9994no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-06-03T06:52:20+00:00