is 2 1791617 - 1
has 539331 decimal digits
takes 0.097 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6B38EBAA883A9002double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.585068.6567%500000150000000.10155.0556%16.686470.2413%1.5846%
PrimeNet2570.010763.1579%80001400000.00122.8150%0.011964.1950%1.0371%
GPU722610.171565.5738%80001300000.00121.4937%0.172666.0880%0.5142%
Difference+6+16.4135+3.0829%+492000+14870000+0.1003+3.5620%+16.5138+4.1533%+4.1533%

Known prime factors (1 factor, 69.1 bits, 0.00385932% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17916176523773079319540421432169.144182063830587663
3 × 60687943529221
2014-03-1036068794352922197.014260,093485,782

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:34:00Carsten Kossendeyleela950001638750---0.014--2.446%
2016-03-16T12:34:39alpertronManual testing5000001500000012---0.101--5.056%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-19T13:16:00Architects Cubeda3_bu2260261--0.086--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.891--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.122 GHz-days
Estimated T-Level:24.696
DigitsB1CurvesCompleteFacMiss
2011000263 / 1002.6307.113%
2550000263 / 2800.93939.025%

New Calculation Method

Total ECM effort:18.122 GHz-days
Estimated T-Level:24.696
DigitsB1CompleteFacMiss
20110008.4840.021%
25500000.76746.451%
302500000.04795.388%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000026318.12


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computers6B38EBAA883A90020.097
1999-02-21T00:00:00ANONYMOUSv4_computers6B38EBAA883A90020.097


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T16:30:46Oliver KruseGTX-0
652377307931954042143
7FEA5C23E8D5D0__no
2017-11-11T02:35:12kkmrkkblmbrbkc4.xlarge
652377307931954042143
7FEA5C23E8D5D0__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1638750 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-11-27T15:58:56+00:00