is 2 1966127 - 1
has 591864 decimal digits
takes 0.129 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.112968.6567%500000196403361010.246810.0563%25.359771.8087%3.1520%
PrimeNet2580.019563.7931%80001400000.00142.4707%0.021064.6877%0.8946%
GPU722620.312566.1290%80001000000.00121.1954%0.313766.5339%0.4049%
Difference+5+14.8004+2.5277%+492000+1963933610+10.2455+8.8609%+25.0460+5.2748%+5.2748%

Known prime factors (3 factors, 137.4 bits, 0.00698723% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1966127519057529928.951132
22 × 3 × 11
-4111.871e-114.177e-77.761e-7
1966127145493398011133.7603700
22 × 52 × 37
2008-07-1525371.048e-92.446e-64.851e-6
1966127299773064747124676164072374.6667623441027642789
32 × 847049003071421
2021-01-2198470490030714213,390.24,399,7848,217,572

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
196612775519443656884117291962.712
19661271555994662483995442646473727830332103.618
196612743615001821930910512231396571500733108.427
196612722638695073021956419198952980622225163770342137.378
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-12T01:31:23Lisander ViaeneDesktop5000001964033610-
skipped known factor: 519057529
skipped known factor: 14549339801
--10.25--10.056%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:48:00J FeitsmaManual testing??33.760114.66124e-100.2821.01760e-9


ECM factoring results:

Old Calculation Method

Total ECM effort:26.144 GHz-days
Estimated T-Level:24.714
DigitsB1CurvesCompleteFacMiss
2011000264 / 1002.6407.042%
2550000264 / 2800.94338.886%

New Calculation Method

Total ECM effort:26.144 GHz-days
Estimated T-Level:24.714
DigitsB1CompleteFacMiss
201100010.8910.002%
25500001.02935.734%
302500000.06693.649%
3510000000.00399.692%


ECM Summary

B1B2factorcurvesGHz-days
500005000000272.279
50000530646570.605
50000675000070.674
50000675000020.193
50000706985070.689
50000750000021421.70


Lucas-Lehmer results:
No L-L results for M1966127


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T09:46:32Oliver KruseGTX-1
519057529
14549339801
9A67D00458C471__no
2017-11-11T22:45:16ATHec2-1xf
519057529
14549339801
9A67D00458C471__no
2021-01-21T15:57:25mrhlanai
519057529
14549339801
29977306474712467616407
69524E8784162652no


P-1 factor-bounds graph:
B1 = 500000, B2 = 1964033610 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
267
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Last modified: 2022-08-02T10:12:46+00:00