is 2 2179693 - 1
has 656153 decimal digits
takes 0.143 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
Actual26713.632267.1642 %500000150000000.12305.1763 %13.755168.8639 %
Target2620.281964.5161 %110008000000.00511.5687 %0.287065.0728 %
Difference+5+13.3503+2.6481 %+489000+14200000+0.1178+3.6076%+13.4681+3.7911 %

Known prime factors (1 factor, 47.3 bits, 0.00217074% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
21796931751369724215691547.31540174688
25 × 479 × 2621
-47926211.565e-55.679e-59.294e-5

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-20alpertronManual testing5000001500000012
skipped known factor: 175136972421569
---8.263%


Trial Factoring results:
5758596061626364656667
No TF results for M2179693


ECM factoring results:
Total ECM effort:17.690 GHz-days
Estimated T-Level:21.939
DigitsB1CompleteFacMiss
20110004.0721.704%
25500000.38867.858%
302500000.02597.543%
3510000000.00199.882%


ECM Summary

B1B2factorcurvesGHz-days
500005000000252.138
50000539866470.618
50000690000070.692
50000324289355013.91
500003891478510.333


Lucas-Lehmer results:
No L-L results for M2179693


PRP results:
dateuseridcompidcofactorsres64
2017-10-09Oliver KruseGTX-0
175136972421569
7F417F3FD49892DB
2017-11-19Chang Chia-Tcheex01
175136972421569
7F417F3FD49892DB


CERT results:
No CERT results for M2179693


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=21.94 ~= 56-bit
250
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270
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Last modified: 2024-03-13T02:15:48+00:00