is 2 1772011 - 1
has 533429 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L84CA545F02B2690Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.768568.6567%2475400150000000.24845.7887%17.016970.4711%1.8144%
PrimeNet2570.010863.1579%80001400000.00122.8091%0.012064.1928%1.0349%
GPU722610.173465.5738%80001200000.00111.4547%0.174566.0746%0.5008%
Difference+6+16.5951+3.0829%+2467400+14880000+0.2473+4.3340%+16.8424+4.3965%+4.3965%

Known prime factors (1 factor, 87.6 bits, 0.00494569% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17720112408448797004597977237580472787.63867958065638548462093
29 × 643 × 57329 × 104759 × 606829
2015-05-1510475960682928,687,1300.01040.0168

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:45:00Carsten Kossendeyleela950001615000---0.014--2.433%
2014-04-10T20:52:00ANONYMOUSManual testing100000100000---0.008--0.890%
2014-05-09T20:32:00Jocelyn LaroucheManual testing136221136221---0.011--1.059%
2014-09-18T20:49:00Jocelyn LaroucheManual testing172442172442---0.014--1.202%
2015-05-15T23:13:00mikrMSI2475400150000002787.6380.1950.1920.3895.789%
2016-03-16T12:31:23alpertronManual testing5000001500000012-
skipped known factor: 240844879700459797723758047
--0.101--5.049%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-20T13:12:00Architects Cubedm1_tt260261--0.087--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.901--
2015-05-01T22:04:00snme2pm1Manual testing263264--1.108--
2015-05-01T22:04:00snme2pm1Manual testing264265--2.109--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.275 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.275 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025117.27


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers84CA545F02B2690D0.096


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T11:57:18Oliver KruseGTX-1
240844879700459797723758047
E892C2E774023D__no
2017-11-04T10:26:50ATHec2-1xf
240844879700459797723758047
E892C2E774023D__no


P-1 factor-bounds graph:
B1 = 2475400, B2 = 15000000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 172442 (P-1 stage 1)
B1 = 136221 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2020-09-11T10:25:14+00:00