is 2 1915759 - 1
has 576701 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE8D7C0E4401F606Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.112969.1176%80000003200000001.96659.7378%33.079472.1249%3.0073%
PrimeNet2570.010063.1579%90001700000.00143.0916%0.011464.2969%1.1390%
GPU722610.160365.5738%100001700000.00151.7608%0.161866.1799%0.6062%
Difference+7+30.9526+3.5439%+7990000+319830000+1.9650+7.9770%+32.9176+5.9450%+5.9450%

Known prime factors (1 factor, 90.1 bits, 0.00470443% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
191575913505089451059464203915224492890.126352473600569264302136
23 × 241903 × 465079 × 391623391
2020-07-06465079391623391183,465,2181.71303.1348

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-16T23:16:00kurlyslice100000030000000---0.203--5.684%
2017-12-20T12:29:05mikrS063800000032000000012---1.966--9.738%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:28:58Mark RoseManual testing21260--0.080--
2009-05-31T11:48:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.160--
2011-07-17T18:55:00GrunwalderGIMPManual testing21263--0.833--
2016-02-23T16:28:58Mark RoseManual testing262263--0.512--
2015-05-16T20:58:00snme2pm1Manual testing263264--1.025--
2015-05-16T20:58:00snme2pm1Manual testing264265--1.950--
2015-10-02T08:43:13ramgeisManual testing265266--3.901--
2017-03-15T08:26:29Smok_bmvManual testing266267--7.801--
2019-04-28T00:32:12chuenkitManual testing267268--15.60--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.500 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.500 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5250.020%
25500000.76346.642%
302500000.04795.394%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001268.748
50000500000010.069
50000800000012410.68


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computersE8D7C0E4401F606D0.104
2015-07-01T17:35:00MadPooManual testingE8D7C0E4401F606D0.104


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-06T22:38:12C-Murray42
1350508945105946420391522449
12C7F50CD1C79EA6no
2020-07-07T20:01:06pew10980xe_1
1350508945105946420391522449
12C7F50CD1C79EA6no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2022-01-18T14:10:47+00:00