is 2 1858201 - 1
has 559375 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC44A1949A9B4C56Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.990768.6567%2780000917600000.60008.1416%16.590771.2086%2.5518%
PrimeNet2570.010363.1579%90001600000.00143.0256%0.011764.2726%1.1147%
GPU722610.165365.5738%90001500000.00131.6324%0.166666.1358%0.5620%
Difference+6+15.8254+3.0829%+2771000+91610000+0.5987+6.5092%+16.4241+5.0728%+5.0728%

Known prime factors (1 factor, 85.0 bits, 0.00457235% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1858201377195565590490695844649432684.96410149482364676660271
7 × 103 × 17327 × 812428692913
2017-01-22173278124286929133,811,1283,481.96,503.2

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T05:50:00Carsten Kossendeyleela1000001725000---0.015--2.515%
2014-05-26T23:57:00Jocelyn LaroucheManual testing134541134541---0.011--1.061%
2014-09-29T22:04:00Jocelyn LaroucheManual testing169082169082---0.013--1.199%
2015-07-29T00:49:00mikrMSI278000091760000---0.600--8.142%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:55Mark RoseManual testing258260--0.062--
2010-04-13T12:48:00Architects Cubeda3_bu2260261--0.083--
2016-02-23T16:28:55Mark RoseManual testing261262--0.165--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.859--
2016-02-23T16:28:55Mark RoseManual testing262263--0.528--
2015-05-06T21:11:00snme2pm1Manual testing263264--1.057--
2015-05-06T21:11:00snme2pm1Manual testing264265--2.011--
2015-09-09T11:47:00ramgeisManual testing265266--4.021--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.221 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.221 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5640.019%
25500000.77646.034%
302500000.04895.315%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000392.698
50000500000020.138
50000660000021016.38


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00garyfuv4_computersC44A1949A9B4C56A0.101
2015-06-27T00:56:00MadPooManual testingC44A1949A9B4C56A0.101


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T08:10:02Oliver KruseGTX-3
37719556559049069584464943
4194B1B0449C56__no
2017-11-07T05:55:47kkmrkkblmbrbkc4.xlarge
37719556559049069584464943
4194B1B0449C56__no


P-1 factor-bounds graph:
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 100000, B2 = 1725000 (P-1 stage 2)
B1 = 169082 (P-1 stage 1)
B1 = 134541 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2021-07-23T11:17:46+00:00