is 2 28901 - 1
has 8701 decimal digits
takes 0.000 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
Actualunknown500000000100000000000.812850.1801%0.812850.1801%50.1801%
PrimeNet2400.000062.5000%500100000.00004.0646%0.000064.0242%1.5242%
GPU722440.000165.9091%500100000.00001.7394%0.000166.5021%0.5930%
Difference-44-0.0001-65.9091%+499999500+9999990000+0.8128+48.4407%+0.8127-16.3219%-16.3219%

Known prime factors (3 factors, 227.6 bits, 0.78734372% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2890195893519826.5151659
3 × 7 × 79
-7794.204e-108.724e-91.138e-8
2890130954731556638626087372271.39153553045840349168
24 × 73 × 4943 × 9275786057
2009-04-044943927578605732,1160.40360.7539
28901106395263438386331094698112103972149688940129.64518406848108782798362461179907956844
22 × 33 × 277 × 612276363641 × 1004912873472779749
2018-01-0761227636364110049128734727797495.550e+1243,730,08481,674,754

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
289012968358138666425666843110755033097.906
2890110202616216038904970169724212306383311663376239148156.160
2890132934368186330972156604727507319486792044337855196
70169719193
61201.035
2890131581924614289246187878464127129638457631527609597
2416293700658610167
69227.550
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-12-28T07:28:39kkmrkkblmbrbkManual testing5000000001000000000012-
skipped known factor: 95893519
skipped known factor: 3095473155663862608737
--0.813--42.857%


Trial Factoring results:
No TF results for M28901


ECM factoring results:

Old Calculation Method

Total ECM effort:19.202 GHz-days
Estimated T-Level:31.617
DigitsB1CurvesCompleteFacMiss
20110001274 / 10012.7400.000%
25500001274 / 2804.5501.048%
302500001119 / 6401.74817.381%
351000000511 / 15800.32372.360%
403000000500 / 47000.10689.907%

New Calculation Method

Total ECM effort:19.202 GHz-days
Estimated T-Level:31.617
DigitsB1CompleteFacMiss
2011000157.2380.000%
255000031.9010.000%
302500005.4970.410%
3510000000.79745.085%
4030000000.09890.623%
45110000000.01198.945%
50440000000.00199.899%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000001550.089
250000250000006081.747
1000000100000000110.126
30000003000000002388.206
30000003000000002629.034


Lucas-Lehmer results:
No L-L results for M28901


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T19:38:47Oliver KrusePRP
95893519
3095473155663862608737
3B4A214781B241__no
2017-09-21T21:28:58Oliver KruseManual testing
95893519
3095473155663862608737
3B4A214781B241__no
2017-10-12T16:30:09kkmrkkblmbrbkManual testing
95893519
3095473155663862608737
3B4A214781B241__no
2018-01-09T16:49:33AdolfNorManual testing
95893519
3095473155663862608737
1063952634383863310946981121039721496889
FE9247C494E8C0__no
2018-01-10T20:49:27Oliver KruseGTX-5
95893519
3095473155663862608737
1063952634383863310946981121039721496889
FE9247C494E8C0__no


P-1 factor-bounds graph:
B1 = 500000000, B2 = 10000000000 (P-1 stage 2)
B1 = 500000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-01-12T20:45:27+00:00