is 2 8107903 - 1
has 2440723 decimal digits
takes 2.117 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L32646B468E526DF5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2687.351566.1765%2200000190837614040.153112.4040%47.504670.3719%4.1955%
PrimeNet2630.196863.4921%360009000000.03153.6134%0.228364.8113%1.3192%
GPU722673.664865.6716%5500012000000.04442.5723%3.709366.5547%0.8830%
Difference+1+3.6866+0.5048%+2145000+1907176140+40.1087+9.8317%+43.7953+3.8173%+3.8173%

Known prime factors (1 factor, 80.1 bits, 0.00098771% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
810790312799588435719689439469512580.08278932792090135325
3 × 52 × 19 × 1109 × 4787 × 10433923
2012-09-2247871043392352,0670.21690.4020

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-03T00:00:00ANONYMOUSv4_computers40000310000---0.021--1.454%
2022-07-09T22:50:10FlaukrotistColab_HLM222000001908376140-
skipped known factor: 1279958843571968943946951
--40.15--12.404%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-08-24T00:00:00ANONYMOUSv4_computers21261--0.038--
1998-09-06T00:00:00ANONYMOUSv4_computers21262--0.076--
1998-10-11T00:00:00slaurv4_computers21263--0.197--
2012-07-20T13:38:00AxelssonManual testing263264--0.242--
2022-04-08T19:05:34LordJuliusManual testing21264--0.439--
2022-04-10T12:38:58James HeinrichManual testing264265--0.461--
2022-04-08T19:05:34LordJuliusManual testing264265--0.461--
2022-04-10T12:38:58James HeinrichManual testing265266--0.922--
2022-04-08T19:05:34LordJuliusManual testing265266--0.922--
2022-04-10T12:38:58James HeinrichManual testing266267--1.843--
2022-04-08T19:05:34LordJuliusManual testing266267--1.843--
2022-02-06T09:36:04FlaukrotistManual testing267268--3.687--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-30T00:00:00ANONYMOUSv4_computers32646B468E526DF52.117
2002-08-17T00:00:00ANONYMOUSv4_computers32646B468E526DF52.117


PRP results:
dateuseridcompidcofactorsres64PRP
2018-08-15T22:15:07Oliver KruseGTX-2
1279958843571968943946951
C9C49BD65023A0__no
2020-02-06T20:21:17Luigi Morelli9800X
1279958843571968943946951
C9C49BD65023A065no


P-1 factor-bounds graph:
B1 = 2200000, B2 = 1908376140 (P-1 stage 2)
B1 = 2200000 (P-1 stage 1)
B1 = 40000, B2 = 310000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
268
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2022-07-09T22:50:10+00:00