is 2 1802897 - 1
has 542727 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFD274C82B20F0C1Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.481268.6567%2780000917600000.60008.1173%17.081271.2009%2.5442%
PrimeNet2570.010663.1579%80001500000.00122.8710%0.011964.2156%1.0577%
GPU722610.170465.5738%90001300000.00121.5549%0.171666.1091%0.5353%
Difference+6+16.3108+3.0829%+2771000+91630000+0.5988+6.5624%+16.9096+5.0919%+5.0919%

Known prime factors (1 factor, 79.7 bits, 0.00441992% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18028979728757395042586679423992479.687269809018347764367
32 × 47 × 101429 × 6288599701
2017-11-14101429628859970169,18826.95950.338

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00Team Prime Ribv4_computers25000387500---0.004--1.199%
2011-02-07T12:38:00Carsten Kossendeyleela1000001650000---0.015--2.477%
2014-05-12T10:21:00Jocelyn LaroucheManual testing135601135601---0.011--1.060%
2014-09-20T22:31:00Jocelyn LaroucheManual testing171202171202---0.013--1.201%
2015-04-30T18:45:00mikrMSI278000091760000---0.600--8.117%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:52Mark RoseManual testing258260--0.064--
2010-04-11T18:26:00Architects Cubedm1_tt260261--0.085--
2016-02-23T16:28:52Mark RoseManual testing261262--0.170--
2010-12-13T03:33:00GrunwalderGIMPManual testing21263--0.885--
2016-02-23T16:28:52Mark RoseManual testing262263--0.544--
2015-04-20T21:13:00snme2pm1Manual testing263264--1.089--
2015-04-20T21:13:00snme2pm1Manual testing264265--2.072--
2015-08-31T08:30:00ramgeisManual testing265266--4.145--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.307 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.307 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024817.10
50000500000030.207


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00dtlgcv4_computersFD274C82B20F0C1E0.098
2002-10-19T00:00:00dtlgcv4_computersFD274C82B20F0C1E0.098
2015-06-27T00:55:00MadPooManual testingFD274C82B20F0C1E0.098


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-15T02:43:26kkmrkkblmbrbkc4.xlarge
972875739504258667942399
CA00B51A455ED8__no
2017-11-15T12:46:00Oliver KruseGTX-2
972875739504258667942399
CA00B51A455ED8__no


P-1 factor-bounds graph:
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 171202 (P-1 stage 1)
B1 = 135601 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2021-01-29T12:54:53+00:00