is 2 1867799 - 1
has 562264 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-L387059B231ADC286double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.908568.6567%500000150000000.10155.0811%16.010070.2493%1.5926%
PrimeNet2570.010363.1579%90001600000.00143.0284%0.011664.2736%1.1157%
GPU722610.164565.5738%100001500000.00141.6892%0.165866.1553%0.5815%
Difference+6+15.7441+3.0829%+490000+14850000+0.1001+3.3918%+15.8441+4.0940%+4.0940%

Known prime factors (1 factor, 66.0 bits, 0.00353595% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1867799760916790594615656572066.04420369343558772
22 × 13 × 67 × 5846539483
2015-06-206758465394839.86725.05746.799

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-08T15:23:00markrtiny2750006000000---0.046--3.927%
2016-03-16T12:37:42alpertronManual testing5000001500000012---0.101--5.081%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-06T01:39:00Architects CubedManual testing260261--0.082--
2011-03-08T05:14:00GrunwalderGIMPManual testing21263--0.854--
2015-05-07T23:39:00snme2pm1Manual testing263264--1.051--
2015-05-07T23:39:00snme2pm1Manual testing264265--2.000--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.236 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:19.236 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110008.5580.019%
25500000.77446.097%
302500000.04895.322%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000191.315
50000500000020.138
500005270487140.990
50000660000020816.24
50000675000070.552


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers387059B231ADC2860.101


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T10:41:16Oliver KruseGTX-0
76091679059461565657
E491E05F41F32E__no
2017-11-07T13:15:39kkmrkkblmbrbkc4.xlarge
76091679059461565657
E491E05F41F32E__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)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2021-09-03T08:17:13+00:00