is 2 2120051 - 1
has 638199 decimal digits
takes 0.139 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26714.015767.1642 %500000150000000.12305.1591 %14.138668.8582 %
Target2620.289864.5161 %100007000000.00451.4541 %0.294365.0321 %
Difference+5+13.7259+2.6481 %+490000+14300000+0.1184+3.7050%+13.8443+3.8261 %

Known prime factors (1 factor, 43.2 bits, 0.00203801% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2120051101520295774791443.2072394289
251 × 9539
-25195396.878e-77.217e-59.255e-5

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 10152029577479
---8.237%


Trial Factoring results:
5758596061626364656667
No TF results for M2120051


ECM factoring results:
Total ECM effort:14.098 GHz-days
Estimated T-Level:22.155
DigitsB1CompleteFacMiss
20110004.5511.055%
25500000.43164.987%
302500000.02997.188%
3510000000.00199.859%


ECM Summary

B1B2factorcurvesGHz-days
500005000000201.704
50000661098570.675
500006750000141.363
50000700000080.793
5967259672503.027
653139320704506.536


Lucas-Lehmer results:
No L-L results for M2120051


PRP results:
dateuseridcompidcofactorsres64
2017-10-07Oliver KruseGTX-2
10152029577479
D8D32224E2B9E429
2017-11-17kkmrkkblmbrbkc4.xlarge
10152029577479
D8D32224E2B9E429


CERT results:
No CERT results for M2120051


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
TF factor-bounds graph:
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=22.15 ~= 57-bit
250
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270
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Last modified: 2024-03-13T02:15:48+00:00