is 2 1765891 - 1
has 531587 decimal digits
takes 0.096 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
Actual26716.826668.6567 %500000150000000.10155.0468 %16.928170.2386 %
Target2610.174065.5738 %80006000000.00321.4537 %0.177166.0742 %
Difference+6+16.6526+3.0829 %+492000+14400000+0.0983+3.5932%+16.7509+4.1644 %

Known prime factors (2 factors, 91.9 bits, 0.00520407% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
176589170635641826.07420
22 × 5
-455.085e-123.189e-76.404e-7
1765891653287825475261150712065.82418497399484885
3 × 5 × 23339 × 52836881
2018-03-2323339528368815.27180.22820.4229

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 70635641
---8.831%


Trial Factoring results:
5758596061626364656667
No TF results for M1765891


ECM factoring results:
Total ECM effort:38.373 GHz-days
Estimated T-Level:25.710
DigitsB1CompleteFacMiss
201100014.9690.000%
25500001.68518.553%
302500000.14286.766%
3510000000.01099.032%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026618.30
50000500000010.069
250000400000004720.00


Lucas-Lehmer results:
No L-L results for M1765891


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-1
70635641
FDEB375BBAC04B5C
2017-11-04Chang Chia-Tcheex01
70635641
FDEB375BBAC04B5C
2018-03-25NetaniasWin10
70635641
65328782547526115071
4A4364BF80724F07
2018-03-27kkmrkkblmbrbkold
70635641
65328782547526115071
4A4364BF80724F07


CERT results:
No CERT results for M1765891


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00