is 2 28751 - 1
has 8655 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
Actual2671,033.491677.6119%500000000100000000000.812813.6602%1,034.304480.6702%3.0583%
PrimeNet2400.000062.5000%500100000.00004.0592%0.000064.0222%1.5222%
GPU722440.000165.9091%500100000.00001.7367%0.000166.5012%0.5921%
Difference+23+1,033.4915+11.7028%+499999500+9999990000+0.8128+11.9235%+1,034.3043+14.1690%+14.1690%

Known prime factors (5 factors, 255.3 bits, 0.88780184% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2875157503515.8111
1
-111.519e-137.987e-101.626e-9
2875122770793824.441396
22 × 32 × 11
2008-08-269118.440e-117.275e-91.463e-8
28751135302207927.0122353
13 × 181
2008-08-26131819.386e-101.769e-82.113e-8
28751142969222532137723545832373.598248633478021873541
347 × 2729 × 262558809607
2010-04-192729262558809607110,61611.42521.340
287512721848492143374194996178984081297735114.390473348490860035163124096376488
23 × 3 × 19722853785834798463504015687
2017-12-278197228537858347984635040156876.286e+128.583e+171.603e+18

26 Composite Factors:
exponentprime factorscomposite factordigitsbits*
2875113093889098791340.252
2875177802828091211342.823
2875130809385480401511651.452
287511771632093279528029532167.264
287518221159203265515517055862492789.409
287513255522571650243950353320943193098.039
28751193440513416723624237066646468131100.610
287511872023144376039778771670141962545735113.850
2875111123409843001858564504043371855154336116.421
287514404793888825936385712027533929286203338125.050
28751156514453843720446334865280121626861643140130.201
2875161978648591958900115799627437465525098076142138.831
28751253288862989157819987598719283535744548359943140.862
28751368272108106620689009831373113217446234023943141.402
287513563958229983412633358825976536580089714669978347154.642
2875121176751032455009480132333448129342810795076321748157.213
287518385847941369481638960245162066840032183587783952750165.842
2875148221141417256930268513097755432950237065284834063
21081
55181.654
2875138914056277200958155930509845569613206362877984423
1823591
57187.988
2875122376749781078866968404721076497894682054845727382
862551953273
62203.800
2875188610392027849363757035536207792762941215537746755
75099003177663
64212.429
2875152651576976274934210120481207407978389572438341641
681951496965337
65215.000
2875150953633727774219641208144385567072474087170670516
9594917979725155489
69228.240
2875130276236308667375418845580308695809813355839219594
21637256929997773511
70230.811
2875111989181604503224379872719826342771424574273519827
86019889373437817002241
73239.441
2875168941390980374891151582100817418838522729445021066
144501698640794791079864223
77255.252
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-12-28T07:28:38kkmrkkblmbrbkManual testing5000000001000000000012-
skipped known factor: 57503
skipped known factor: 22770793
skipped known factor: 135302207
--0.813--13.660%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T19:59:00ANONYMOUSManual testing??27.01293.16738e-103.75801e-57.51598e-10
2008-08-26T19:59:00ANONYMOUSManual testing??24.44186.66322e-123.75812e-51.58118e-11


ECM factoring results:

Old Calculation Method

Total ECM effort:19.207 GHz-days
Estimated T-Level:31.617
DigitsB1CurvesCompleteFacMiss
20110001274 / 10012.7400.000%
25500001274 / 2804.5501.048%
302500001121 / 6401.75217.327%
351000000511 / 15800.32372.360%
403000000500 / 47000.10689.907%

New Calculation Method

Total ECM effort:19.207 GHz-days
Estimated T-Level:31.617
DigitsB1CompleteFacMiss
2011000157.3400.000%
255000031.9190.000%
302500005.4990.409%
3510000000.79745.076%
4030000000.09890.622%
45110000000.01198.944%
50440000000.00199.899%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000001530.088
250000250000006101.753
1000000100000000110.126
30000003000000002077.137
300000030000000029310.10


Lucas-Lehmer results:
No L-L results for M28751


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T19:38:40Oliver KruseOliver-PC
57503
22770793
135302207
14296922253213772354583
1FDEA1FB8E0AF546no
2017-09-21T20:27:19Oliver KruseManual testing
57503
22770793
135302207
14296922253213772354583
1FDEA1FB8E0AF546no
2017-10-02T10:29:35kkmrkkblmbrbkManual testing
57503
22770793
135302207
14296922253213772354583
1FDEA1FB8E0AF5__no
2017-12-07T03:12:13ATHxps
57503
22770793
135302207
14296922253213772354583
1FDEA1FB8E0AF5__no
2017-12-30T08:07:49Oliver KruseGTX-1
57503
22770793
135302207
14296922253213772354583
27218484921433741949961789840812977
9E6B24A9D288AA__no
2017-12-30T19:23:18BloodERazorManual testing
57503
22770793
135302207
14296922253213772354583
27218484921433741949961789840812977
9E6B24A9D288AA__no
2017-12-30T19:47:39kkmrkkblmbrbkc4.xlarge
57503
22770793
135302207
14296922253213772354583
27218484921433741949961789840812977
9E6B24A9D288AA__no
2022-05-12T18:18:48Jorge CoveiroManual testing
57503
9E6B24A9D288AA83no


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: 2022-05-12T18:18:48+00:00