is 2 1661029 - 1
has 500020 decimal digits
takes 0.078 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L69E76521827AF02Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.888968.6567%500000150000000.08805.0097%17.976970.2269%1.5702%
PrimeNet2570.011663.1579%70001200000.00092.5668%0.012564.1036%0.9457%
GPU722610.184965.5738%7000800000.00071.2054%0.185765.9887%0.4150%
Difference+6+17.7039+3.0829%+493000+14920000+0.0873+3.8044%+17.7912+4.2382%+4.2382%

Known prime factors (2 factors, 123.6 bits, 0.00743837% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16610293686719712642809031858.355110976982119
34 × 31 × 53 × 833893
-818338930.04160.00310.0058
1661029423305007771421923592065.19812742252175351
24443 × 521304757
2018-01-16244435213047576.27261.93983.6200

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
16610291560606916611318677407900994503622017738123.553
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:18:03alpertronManual testing5000001500000012-
skipped known factor: 368671971264280903
--0.088--5.010%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-14T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-04-27T00:00:00ANONYMOUSv4_computers21258--0.023--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.884 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.884 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024814.71
50000500000030.178


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers69E76521827AF02B0.078


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T20:37:12Oliver KruseGTX-0
368671971264280903
501BD6BAB80245__no
2017-11-02T16:32:08ATHec2-1xf
368671971264280903
501BD6BAB80245__no
2018-01-21T11:58:12AdolfNorManual testing
368671971264280903
42330500777142192359
A40EE5F0B215EF__no
2018-01-22T09:54:27noknopcr2-srv
368671971264280903
42330500777142192359
no
2018-01-24T02:47:45Oliver KruseGTX-7
368671971264280903
42330500777142192359
A40EE5F0B215EF__no
2018-01-26T00:16:16kkmrkkblmbrbkc4.xlarge
368671971264280903
42330500777142192359
BCDC88204D7CFB__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
258
257
250
260
270
280
290
2100
Last modified: 2019-11-25T15:14:30+00:00