is 2 1782839 - 1
has 536689 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-L7522D5135075E542double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.666668.6567%500000150000000.10155.0527%16.768170.2404%1.5837%
PrimeNet2570.010863.1579%80001400000.00122.8124%0.012064.1940%1.0361%
GPU722610.172365.5738%80001300000.00121.4921%0.173566.0875%0.5137%
Difference+6+16.4943+3.0829%+492000+14870000+0.1003+3.5605%+16.5947+4.1529%+4.1529%

Known prime factors (1 factor, 68.4 bits, 0.00383572% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17828393853549066564779576232168.385108073389312349
3940253 × 27428033
2015-02-1239402532742803339.0140.41060.6308

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:50:00Carsten Kossendeyleela950001615000---0.014--2.435%
2014-04-10T20:52:00ANONYMOUSManual testing100000100000---0.008--0.891%
2014-05-09T20:32:00Jocelyn LaroucheManual testing136001136001---0.011--1.060%
2014-09-19T20:39:00Jocelyn LaroucheManual testing172002172002---0.014--1.201%
2016-03-16T12:33:30alpertronManual testing5000001500000012---0.101--5.053%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-20T22:46:00Architects Cubedm1_76l260261--0.086--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.895--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.768 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:17.768 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.3230.024%
25500000.75247.133%
302500000.04695.474%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025717.70
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computers7522D5135075E5420.097


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T14:31:59Oliver KruseGTX-0
385354906656477957623
35C7E4037B81C7__no
2017-11-04T19:02:49ATHec2-1xf
385354906656477957623
35C7E4037B81C7__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 172002 (P-1 stage 1)
B1 = 136001 (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
263
261
258
250
260
270
280
290
2100
Last modified: 2020-11-13T10:46:23+00:00