is 2 1998977 - 1
has 601753 decimal digits
takes 0.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.864668.6567%----14.864668.6567%0.0000%
PrimeNet2580.019263.7931%80001400000.00142.4786%0.020764.6905%0.8974%
GPU722620.307366.1290%80001100000.00131.2365%0.308666.5479%0.4188%
Difference+5+14.5572+2.5277%-8000-110000-0.0013-1.2365%+14.5559+2.1089%+2.1089%

Known prime factors (3 factors, 130.4 bits, 0.00652402% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
199897715991817823.9314
22
-445.595e-133.813e-77.761e-7
1998977855042421991136.31521387
3 × 7129
2008-07-15371297.461e-93.730e-56.912e-5
199897713259195115330458776332270.167331649516611008
26 × 32 × 1601 × 359637983
2021-04-031601359637983126.991.86823.4890

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
199897713673681939700855831960.246
1998977212038621851658591277113291612994.098
199897711337174305050132851331054883496733106.483
1998977181302016783463900384174436113835546503940130.414
P-1 results:
No P-1 results for M1998977


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:49:00J FeitsmaManual testing??36.315112.88163e-90.2866.27519e-9


ECM factoring results:

Old Calculation Method

Total ECM effort:3.467 GHz-days
Estimated T-Level:2.000
DigitsB1CurvesCompleteFacMiss
201100040 / 1000.40066.897%
255000040 / 2800.14386.666%

New Calculation Method

Total ECM effort:3.467 GHz-days
Estimated T-Level:2.000
DigitsB1CompleteFacMiss
20110001.30627.093%
25500000.11888.837%
302500000.00799.273%


ECM Summary

B1B2factorcurvesGHz-days
500005000000272.284
50000500000060.507
50000675000070.676


Lucas-Lehmer results:
No L-L results for M1998977


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T18:13:30Oliver KruseGTX-1
15991817
85504242199
BE9168C0A96797__no
2017-11-13T04:38:32kkmrkkblmbrbkc4.xlarge
15991817
85504242199
BE9168C0A96797__no
2021-04-03T11:20:24Kirill Frolovshodan1
15991817
85504242199
1325919511533045877633
2E12DBDC25550065no
2021-04-07T19:18:46Corkdebilis
15991817
85504242199
1325919511533045877633
2E12DBDC25550065no


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2022-05-24T01:44:04+00:00