is 2 1771993 - 1
has 533424 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L03C35873E7DDC1BDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.768668.6567 %500000150000000.10155.0489 %16.870170.2392 %
Target2610.173465.5738 %80006000000.00321.4547 %0.176566.0746 %
Difference+6+16.5953+3.0829 %+492000+14400000+0.0983+3.5942%+16.6936+4.1646 %

Known prime factors (1 factor, 62.6 bits, 0.00353008% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
177199367645947569490921111962.5531908753239135
5 × 433 × 823 × 1071253
2010-12-1382310712530.76820.00470.0086

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 6764594756949092111
---8.834%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-25ANONYMOUSv4_computers212580.022
2022-03-08LordJuliusManual testing21260
2010-04-20Architects Cubedm1_tt2602610.087


ECM factoring results:
Total ECM effort:38.587 GHz-days
Estimated T-Level:25.717
DigitsB1CompleteFacMiss
201100014.8230.000%
25500001.68418.567%
302500000.14386.638%
3510000000.01099.012%


ECM Summary

B1B2factorcurvesGHz-days
10.069
50000500000025817.65
250000400000004920.87


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17ANONYMOUSv4_computers03C35873E7DDC1BD0.096


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-1
6764594756949092111
BF1E2222563A3B31
2017-11-10kkmrkkblmbrbkc4.xlarge
6764594756949092111
BF1E2222563A3B31


CERT results:
No CERT results for M1771993


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:
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00