is 2 1800787 - 1
has 542091 decimal digits
takes 0.098 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
Actual26716.500568.6567 %500000150000000.10155.0588 %16.602070.2423 %
Target2610.170665.5738 %90006500000.00351.5545 %0.174066.1089 %
Difference+6+16.3299+3.0829 %+491000+14350000+0.0980+3.5043%+16.4280+4.1334 %

Known prime factors (1 factor, 44.7 bits, 0.00248341% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1800787289978713728571444.7218051444
22 × 29 × 31 × 2239
-3122392.260e-61.190e-51.793e-5

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 28997871372857
---8.849%


Trial Factoring results:
5758596061626364656667
No TF results for M1800787


ECM factoring results:
Total ECM effort:38.701 GHz-days
Estimated T-Level:25.717
DigitsB1CompleteFacMiss
201100014.8230.000%
25500001.68418.567%
302500000.14386.638%
3510000000.01099.012%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025817.79
250000400000004920.91


Lucas-Lehmer results:
No L-L results for M1800787


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-0
28997871372857
65A987459FA80D28
2017-11-05kkmrkkblmbrbkc4.xlarge
28997871372857
65A987459FA80D28


CERT results:
No CERT results for M1800787


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=25.72 ~= 69-bit
250
260
270
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00