is 2 1939237 - 1
has 583769 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7028B01007D45722double-checked
PRPF3D3941345B0C90Averified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.736369.1176%80000003200000001.96659.7482%32.702772.1281%3.0105%
PrimeNet2580.019863.7931%80001400000.00122.4641%0.021064.6853%0.8922%
GPU722620.316866.1290%8000900000.00101.1517%0.317866.5191%0.3901%
Difference+6+30.4194+2.9886%+7992000+319910000+1.9655+8.5964%+32.3849+5.6090%+5.6090%

Known prime factors (1 factor, 77.0 bits, 0.00397054% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19392371509295504660431107696412476.99838914673777893860
22 × 3 × 5 × 47 × 13799529708473
2021-03-04471379952970847313,32459,141110,460

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-27T22:23:00markrtiny2750006000000---0.046--3.554%
2015-10-08T11:25:48Bruno Victal5820K-linux5000001500000012---0.101--4.632%
2016-12-16T01:10:43Jocelyn Larouchelow 4M568903568903---0.045--1.892%
2016-12-18T04:24:51Jocelyn Larouchelow 4M682683682683---0.054--2.042%
2016-12-24T21:06:39Jocelyn Larouchelow 4M819219819219---0.064--2.200%
2017-01-04T23:07:21Jocelyn Larouchelow 4M983062983062---0.077--2.363%
2017-01-22T06:40:05Jocelyn Larouchelow 4M11796741179674---0.093--2.533%
2017-04-13T01:58:13Jocelyn Larouchelow 4M14156081415608012---0.166--5.088%
2018-02-04T03:38:01Jocelyn Larouchelow 4M19392372831216012---0.266--5.978%
2018-02-10T08:10:28mikrS062800000032000000012---1.966--9.748%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-30T02:31:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.158--
2011-08-27T22:21:00GrunwalderGIMPManual testing21263--0.823--
2016-02-23T16:28:59Mark RoseManual testing262263--0.506--
2015-05-07T11:40:00lycornManual testing263264--1.012--
2015-05-07T11:40:00lycornManual testing264265--1.927--
2015-09-05T13:49:00ramgeisManual testing265266--3.853--
2017-12-11T15:41:32TJAOIManual testing266267--7.707--
2019-05-10T20:32:08chuenkitManual testing267268--15.41--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.319 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.319 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3110.025%
25500000.74747.368%
302500000.04695.494%
3510000000.00299.789%


ECM Summary

B1B2factorcurvesGHz-days
50000500000018312.72
50000500000060.417
500007500000625.177


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers7028B01007D457220.105
2015-07-12T18:10:00MadPooManual testing7028B01007D457220.105


PRP results:
dateuseridcompidcofactorsres64PRP
2021-03-04T16:19:36mrhw
150929550466043110769641
F3D3941345B0C90Ano


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1939237, B2 = 28312160 (P-1 stage 2)
B1 = 1415608, B2 = 14156080 (P-1 stage 2)
B1 = 1939237 (P-1 stage 1)
B1 = 1415608 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1179674 (P-1 stage 1)
B1 = 983062 (P-1 stage 1)
B1 = 819219 (P-1 stage 1)
B1 = 682683 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 568903 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2022-03-31T09:34:16+00:00