is 2 1550663 - 1
has 466797 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5EB8351823737694double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.162168.6567%100000002000000001.31819.7242%20.480271.7046%3.0479%
PrimeNet2570.012463.1579%65001100000.00082.4207%0.013264.0497%0.8918%
GPU722610.198165.5738%6500600000.00061.0490%0.198765.9349%0.3611%
Difference+6+18.9640+3.0829%+9993500+199940000+1.3175+8.6752%+20.2815+5.7697%+5.7697%

Known prime factors (1 factor, 73.0 bits, 0.00470444% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
155066391231471988591339670172272.9502941692424098316
22 × 7 × 401 × 261996118997
2016-03-02401261996118997642.89924.501,726.7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.994%
2011-02-04T15:52:00James HeinrichWHS800001360000---0.010--2.206%
2013-12-08T16:21:00David Campeaui5-2500k94500027405000---0.155--5.948%
2015-03-25T10:09:00VictordeHollanderManual testing10000000200000000---1.318--9.724%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-25T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2016-02-23T16:28:38Mark RoseManual testing258260--0.074--
2010-04-29T06:30:00Architects Cubeda3_bu2260261--0.099--
2016-02-23T16:28:38Mark RoseManual testing261262--0.198--
2010-06-10T15:34:00GrunwalderGIMPManual testing21263--1.029--
2016-02-23T16:28:38Mark RoseManual testing262263--0.633--
2015-02-16T03:59:00snme2pm1Manual testing263264--1.266--
2015-02-16T03:59:00snme2pm1Manual testing264265--2.410--
2015-10-11T16:52:55ramgeisManual testing265266--4.819--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.029 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.029 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.86
50000500000030.168


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computers5EB83518237376940.069
2015-07-20T22:07:00MadPooManual testing5EB83518237376940.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T18:38:59Oliver KruseGTX-1
9123147198859133967017
7C517AE2FB45E8__no
2017-10-30T16:53:32ATHec2-1xf
9123147198859133967017
7C517AE2FB45E8__no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 945000, B2 = 27405000 (P-1 stage 2)
B1 = 945000 (P-1 stage 1)
B1 = 80000, B2 = 1360000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-07-12T08:38:06+00:00