is 2 17947717 - 1
has 5402802 decimal digits
takes 10.918 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8E6DA683C7BD022Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274213.167366.2162%10000001030837505.78815.2227%218.955367.9807%1.7644%
PrimeNet2650.406561.5385%8000024000000.18214.5647%0.588663.2941%1.7557%
GPU722696.651963.7681%13000036000000.28143.4521%6.933465.0189%1.2508%
Difference+5+206.5153+2.4481%+870000+99483750+5.5066+1.7706%+212.0220+2.9618%+0.5137%

Known prime factors (1 factor, 122.7 bits, 0.00068383% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17947717883525069695733837651944738553469160137122.733246138567288456196866694727400
23 × 3 × 52 × 359 × 941 × 11969 × 38653 × 77783 × 33745711
2022-02-1477783337457117.339e+91.68663.0290

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers2100004567500---0.395--2.267%
2022-02-14T06:28:36masserManual testing100000010308375037122.7335.78821.8411.585.223%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-02-11T00:00:00Net_Forcev4_computers21258--0.002--
2001-03-11T00:00:00Net_Forcev4_computers21259--0.004--
2001-11-03T00:00:00ANONYMOUSv4_computers21266--0.823--
2002-05-25T00:00:00ANONYMOUSv4_computers21266--0.823--
2014-08-19T01:34:00NesowaManual testing266267--0.833--
2018-03-17T17:19:51ramgeisManual testing267268--1.665--
2018-03-17T17:19:51ramgeisManual testing268269--3.331--
2020-03-18T18:59:33lycornManual testing269270--6.662--
2021-09-16T06:43:04SRBaseManual testing270271--13.32--
2021-10-09T10:06:01-Anonymous-Manual testing271272--26.65--
2021-12-25T12:47:00ZacHFXManual testing272273--53.29--
2022-01-11T18:13:30TheJudgerManual testing273274--106.6--


ECM factoring results:
Total ECM effort:0.925 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.925


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-02-16T00:00:00ANONYMOUSv4_computers8E6DA683C7BD022E10.92
2007-12-18T00:00:00WWU-CSv4_computers8E6DA683C7BD022E10.92


PRP results:
No PRP results for M17947717


P-1 factor-bounds graph:
B1 = 1000000, B2 = 103083750 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 210000, B2 = 4567500 (P-1 stage 2)
B1 = 210000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-02-14T13:33:31+00:00