is 2 2818817 - 1
has 848549 decimal digits
takes 0.218 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
Actual26710.541367.1642 %3600002873801701.79167.9975 %12.332969.7902 %
Target2630.566265.0794 %1500013000000.00951.7920 %0.575765.7051 %
Difference+4+9.9751+2.0848 %+345000+286080170+1.7821+6.2055%+11.7572+4.0851 %

Known prime factors (3 factors, 128.2 bits, 0.00454639% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
281881739463439825.2347
7
-171.586e-121.486e-72.279e-7
2818817104183476331133.2781848
23 × 3 × 7 × 11
2008-09-078114.060e-109.142e-71.823e-6
28188179210823584616086857032169.642163381013819203
163381013819203
2018-05-03116338101381920342.354996,8941,861,921

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-08-23USAFSS6917th_Scty_Sq360000287380170
skipped known factor: 39463439
skipped known factor: 10418347633
--1.97411.281%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-09-07Will EdgingtonManual testing??33.27811


ECM factoring results:
Total ECM effort:0.203 GHz-days
Estimated T-Level:0.385
DigitsB1CompleteFacMiss
20110000.07792.596%
25500000.00799.291%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020.203


Lucas-Lehmer results:
No L-L results for M2818817


PRP results:
dateuseridcompidcofactorsres64
2017-10-22Oliver KruseGTX-0
39463439
10418347633
FC2FD642AFAE9E4C
2017-12-06kkmrkkblmbrbkc4.xlarge
39463439
10418347633
FC2FD642AFAE9E4C
2018-05-05Oliver KruseGTX-2
39463439
10418347633
921082358461608685703
FC2FD642AFAE9E4C


CERT results:
No CERT results for M2818817


P-1 factor-bounds graph:
B1 = 360000, B2 = 287380170 (P-1 stage 2)
B1 = 360000 (P-1 stage 1)
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TF factor-bounds graph:
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=0.38 ~= -15-bit
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Last modified: 2024-02-09T03:30:02+00:00