is 2 1914623 - 1
has 576359 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-LA2DF3876B02A5DBFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26831.131469.1176 %1820000058341353070251.390117.5111 %282.521574.5255 %
Target2610.160465.5738 %100008500000.00441.7606 %0.164866.1799 %
Difference+7+30.9710+3.5439 %+18190000+58340503070+251.3857+15.7505%+282.3567+8.3456 %

Known prime factors:
No known factors for M1914623

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-07-21kurlyslice10000003000000012--0.20310.443%
2017-12-16mikrS059800000032000000012--1.96615.744%
2023-01-11JossManual testing19146231890473970--9.9917.575%
2023-06-21JossJoss19146235395249860--28.2019.196%
2023-10-09Sid & AndyPterodactyl1820000058341353070--304.725.537%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-01ANONYMOUSv4_computers212580.020
2009-05-30Architects Cubedi4l_12602610.080
2011-07-17GrunwalderGIMPManual testing212630.833
2016-02-23Mark RoseManual testing2582630.733
2015-05-16snme2pm1Manual testing2632652.977
2015-09-02ramgeisManual testing2652663.903
2018-02-19TJAOIManual testing2662677.806
2019-04-27chuenkitManual testing26726815.61


ECM factoring results:
Total ECM effort:38.396 GHz-days
Estimated T-Level:25.684
DigitsB1CompleteFacMiss
201100015.7790.000%
25500001.71418.022%
302500000.13787.218%
3510000000.00999.120%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020113.85
5000080000001008.614
250000400000003715.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15foxkidv4_computersA2DF3876B02A5DBF0.104
2015-06-27MadPooManual testingA2DF3876B02A5DBF0.104


PRP results:
No PRP results for M1914623


CERT results:
No CERT results for M1914623


P-1 factor-bounds graph:
B1 = 18200000, B2 = 58341353070 (P-1 stage 2)
B1 = 1914623, B2 = 5395249860 (P-1 stage 2)
B1 = 1914623, B2 = 1890473970 (P-1 stage 2)
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 18200000 (P-1 stage 1)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1914623 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
268
267
266
265
263
261
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.68 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00