is 2 1630253 - 1
has 490756 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L970BCB53E1107A40double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.226668.6567%1000000200000000.13185.6800%18.358470.4370%1.7803%
PrimeNet2570.011863.1579%70001200000.00092.5574%0.012664.1001%0.9422%
GPU722610.188465.5738%6500700000.00061.1184%0.189165.9588%0.3850%
Difference+6+18.0381+3.0829%+993500+19930000+0.1312+4.5616%+18.1693+4.4782%+4.4782%

Known prime factors (1 factor, 78.5 bits, 0.00481827% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16302534424777353416680475498172478.550135708302742478636
22 × 27986051 × 1212285209
2016-07-3127986051121228520937,6805.99167.9896

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T16:07:00AxonManual testing100000100000---0.006--0.876%
2012-02-29T17:11:00AxonManual testing200000200000---0.013--1.279%
2012-02-29T18:05:00AxonManual testing300000300000---0.019--1.559%
2012-02-29T18:11:00AxonManual testing400000400000---0.026--1.779%
2012-02-29T19:07:00AxonManual testing500000500000---0.032--1.961%
2012-02-29T19:11:00AxonManual testing600000600000---0.039--2.117%
2012-02-29T20:06:00AxonManual testing700000700000---0.045--2.254%
2012-02-29T20:11:00AxonManual testing800000800000---0.052--2.377%
2012-02-29T21:06:00AxonManual testing900000900000---0.058--2.488%
2012-02-29T21:12:00AxonManual testing10000001000000---0.065--2.590%
2012-03-01T06:05:00AxonManual testing10000008000000---0.089--4.716%
2012-03-01T07:07:00AxonManual testing100000020000000---0.132--5.680%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-06-23T00:00:00ANONYMOUSv4_computers21258--0.024--
2016-02-23T16:28:42Mark RoseManual testing258260--0.071--
2010-04-28T22:50:00Architects Cubedm1_f2260261--0.094--
2016-02-23T16:28:42Mark RoseManual testing261262--0.188--
2010-09-13T18:09:00GrunwalderGIMPManual testing21263--0.979--
2016-02-23T16:28:42Mark RoseManual testing262263--0.602--
2015-05-02T16:12:00omylistManual testing263264--1.204--
2015-05-03T12:18:00monstManual testing264265--2.292--
2015-10-11T16:52:47ramgeisManual testing265266--4.584--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.099 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.099 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.93
50000500000030.169


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computers970BCB53E1107A400.073
2015-06-27T00:54:00MadPooManual testing970BCB53E1107A400.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T15:49:43Oliver KruseGTX-2
442477735341668047549817
B3422848AF76ED__no
2017-11-01T20:09:57kkmrkkblmbrbkc4.xlarge
442477735341668047549817
B3422848AF76ED__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 8000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 900000 (P-1 stage 1)
B1 = 800000 (P-1 stage 1)
B1 = 700000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 400000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
104
105
106
107
108
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2019-10-28T14:13:16+00:00