is 2 28393 - 1
has 8548 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
Actual2671,046.522677.6119%500000000100000000000.812813.6491%1,047.335480.6677%3.0558%
PrimeNet2400.000062.5000%500100000.00004.0462%0.000064.0173%1.5173%
GPU722440.000165.9091%500100000.00001.7303%0.000166.4990%0.5899%
Difference+23+1,046.5226+11.7028%+499999500+9999990000+0.8128+11.9187%+1,047.3353+14.1687%+14.1687%

Known prime factors (2 factors, 175.3 bits, 0.61748121% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28393133042597705811385532063.529234287672499932
22 × 58571918124983
2014-04-2345857191812498371.9572,548.84,760.5
28393449802179324464586186155483089145734111.79379210048132367940370189040096
25 × 13 × 23 × 41 × 719 × 280831851633456676043
2018-02-187192808318516334566760436.692e+121.222e+102.282e+10

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
2839359842850391061973584150319917438026462539311021041
721
53175.321
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-12-28T07:28:38kkmrkkblmbrbkManual testing5000000001000000000012---0.813--13.649%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-10-21T00:00:00ANONYMOUSv4_computers252253--0.021--
2000-03-15T00:00:00ANONYMOUSv4_computers253254--0.042--
2000-10-15T00:00:00ANONYMOUSv4_computers21256--0.338--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.207 GHz-days
Estimated T-Level:31.617
DigitsB1CurvesCompleteFacMiss
20110001283 / 10012.8300.000%
25500001283 / 2804.5821.015%
302500001119 / 6401.74817.381%
351000000511 / 15800.32372.360%
403000000500 / 47000.10689.907%

New Calculation Method

Total ECM effort:19.207 GHz-days
Estimated T-Level:31.617
DigitsB1CompleteFacMiss
2011000157.5280.000%
255000031.9270.000%
302500005.4990.409%
3510000000.79745.081%
4030000000.09890.623%
45110000000.01198.945%
50440000000.00199.899%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001640.094
250000250000006081.747
1000000100000000110.126
300000030000000030910.65
30000003000000001916.586


Lucas-Lehmer results:
No L-L results for M28393


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T19:38:15Oliver KruseOliver-PC
13304259770581138553
A0569BFEC18225__no
2017-09-21T20:27:18Oliver KruseManual testing
13304259770581138553
A0569BFEC18225__no
2017-10-12T16:30:08kkmrkkblmbrbkManual testing
13304259770581138553
A0569BFEC18225__no
2018-02-21T03:00:34Oliver KruseGTX-5
13304259770581138553
4498021793244645861861554830891457
EFE338459BE67D__no
2018-02-21T17:35:31kkmrkkblmbrbkc5.large
13304259770581138553
4498021793244645861861554830891457
EFE338459BE67D__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: 2018-02-21T17:35:31+00:00