is 2 1938191 - 1
has 583454 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-L5FC4C3698F9DE7C8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.330768.6567%1415608141560800.16605.5753%15.496770.4042%1.7475%
PrimeNet2580.019863.7931%80001400000.00122.4639%0.021064.6852%0.8921%
GPU722620.317066.1290%8000900000.00101.1516%0.318066.5191%0.3901%
Difference+5+15.0138+2.5277%+1407608+14066080+0.1650+4.4237%+15.1787+3.8851%+3.8851%

Known prime factors (1 factor, 75.6 bits, 0.00389926% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1938191562845908646207305384392375.57514519877263030509
29 × 4519 × 110795623559		2017-12-2945191107956235596,040.8474.84886.87

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-27T10:01:00markrtiny2750006000000---0.046--3.946%
2015-10-08T10:51:46Bruno Victal5820K-linux5000001500000012---0.101--5.104%
2016-12-14T20:31:00Jocelyn Larouchelow 4M568903568903---0.045--2.124%
2016-12-18T04:24:52Jocelyn Larouchelow 4M682683682683---0.054--2.288%
2016-12-24T02:11:55Jocelyn Larouchelow 4M819219819219---0.064--2.458%
2017-01-04T23:07:25Jocelyn Larouchelow 4M983062983062---0.077--2.636%
2017-01-22T06:40:04Jocelyn Larouchelow 4M11796741179674---0.093--2.820%
2017-04-07T19:58:14Jocelyn Larouchelow 4M14156081415608012---0.166--5.575%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-27T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-31T01:16:00S485122USB-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--
2015-05-08T12:54:00lycornManual testing263264--1.013--
2015-05-08T12:54:00lycornManual testing264265--1.928--
2015-09-05T13:49:00ramgeisManual testing265266--3.856--
2017-12-18T13:17:36TJAOIManual testing266267--7.711--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.928 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:20.928 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110009.0620.012%
25500000.80544.687%
302500000.05095.129%
3510000000.00299.770%


ECM Summary

B1B2factorcurvesGHz-days
500005000000432.990
50000500000010.070
50000750000021417.87


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-07-11T00:00:00BJBv4_computers5FC4C3698F9DE7C80.105
2015-11-13T16:44:30MadPooManual testing5FC4C3698F9DE7C80.105


PRP results:
dateuseridcompidcofactorsres64PRP
2018-01-01T11:44:04Oliver KruseGTX-7
56284590864620730538439
B40516B28B3E97__no
2018-01-02T00:30:38kkmrkkblmbrbkc4.xlarge
56284590864620730538439
B40516B28B3E97__no


P-1 factor-bounds graph:
B1 = 1415608, B2 = 14156080 (P-1 stage 2)
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)
102
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1010
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TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
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2100
Last modified: 2022-04-07T09:50:27+00:00