is 2 1878841 - 1
has 565588 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3C485F904119AC43double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.815068.6567%500000150000000.10155.0847%15.916570.2504%1.5937%
PrimeNet2570.010263.1579%90001600000.00143.0317%0.011664.2749%1.1170%
GPU722610.163565.5738%100001500000.00141.6912%0.164966.1560%0.5822%
Difference+6+15.6515+3.0829%+490000+14850000+0.1001+3.3935%+15.7516+4.0944%+4.0944%

Known prime factors (1 factor, 65.4 bits, 0.00348184% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1878841493031958991008525592065.41813120640836319
101921 × 128733439
2013-10-071019211287334397.80790.55931.0305

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-13T16:24:00markrtiny2750006000000---0.046--3.930%
2016-03-16T12:39:11alpertronManual testing5000001500000012---0.101--5.085%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2010-04-12T01:44:00Architects Cubedm1_f2260261--0.082--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.849--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.185 GHz-days
Estimated T-Level:24.679
DigitsB1CurvesCompleteFacMiss
2011000262 / 1002.6207.185%
2550000262 / 2800.93639.165%

New Calculation Method

Total ECM effort:20.185 GHz-days
Estimated T-Level:24.679
DigitsB1CompleteFacMiss
20110008.9610.013%
25500000.81244.392%
302500000.05095.100%
3510000000.00299.769%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000332.286
50000660000022217.35
50000675000070.553


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers3C485F904119AC430.102
1999-03-15T00:00:00ANONYMOUSv4_computers3C485F904119AC430.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T13:08:55Oliver KruseGTX-2
49303195899100852559
6408889F3F3706__no
2017-11-08T05:47:07kkmrkkblmbrbkold
49303195899100852559
6408889F3F3706__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
104
105
106
104
105
106
107
108
109
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2021-11-04T11:47:09+00:00