is 2 1923263 - 1
has 578960 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-L51016DEDB9280CB2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.449768.6567%80000003200000001.966510.4738%17.416271.9395%3.2828%
PrimeNet2570.010063.1579%90001700000.00143.0938%0.011464.2977%1.1398%
GPU722610.159765.5738%100001700000.00151.7621%0.161266.1804%0.6066%
Difference+6+15.2900+3.0829%+7990000+319830000+1.9650+8.7116%+17.2550+5.7591%+5.7591%

Known prime factors (1 factor, 72.4 bits, 0.00376414% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
192326362065101774649415105772272.3941613536520347176
23 × 3 × 50047 × 1343351017
2018-04-23500471343351017733.645.761010.753

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-09-27T14:07:00kurlyhex100000030000000---0.203--6.226%
2018-01-18T12:53:23Jocelyn Larouchelow 4M19232633000000012---0.272--6.585%
2018-01-19T11:47:25mikrS069800000032000000012---1.966--10.474%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-12-16T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2009-06-04T17:48:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.160--
2011-08-27T22:20:00GrunwalderGIMPManual testing21263--0.830--
2016-02-23T16:28:58Mark RoseManual testing262263--0.510--
2015-05-17T10:45:00snme2pm1Manual testing263264--1.021--
2015-05-17T10:45:00snme2pm1Manual testing264265--1.943--
2015-09-03T11:06:00ramgeisManual testing265266--3.885--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.309 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.309 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5640.019%
25500000.77646.034%
302500000.04895.315%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000392.709
50000500000020.139
50000660000021016.46


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers51016DEDB9280CB20.104
2000-11-05T00:00:00ANONYMOUSv4_computers51016DEDB9280CB20.104
2015-06-27T00:56:00MadPooManual testing51016DEDB9280CB20.104


PRP results:
dateuseridcompidcofactorsres64PRP
2018-04-23T21:13:17ATHwork200599
6206510177464941510577
F6556472F092AB__no
2018-04-25T05:40:06BattlemaxxWork-2
6206510177464941510577
F6556472F092AB__no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1923263, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1923263 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
103
104
105
106
107
103
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: 2022-02-17T11:37:28+00:00