is 2 1923671 - 1
has 579083 decimal digits
takes 0.104 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
Actual26715.446568.6567%500000150000000.10155.0991%15.547970.2550%1.5982%
PrimeNet2570.010063.1579%90001700000.00143.0939%0.011464.2978%1.1399%
GPU722610.159765.5738%100001700000.00151.7622%0.161266.1804%0.6067%
Difference+6+15.2868+3.0829%+490000+14830000+0.1000+3.3369%+15.3868+4.0745%+4.0745%

Known prime factors (3 factors, 167.4 bits, 0.00870204% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19236711015736761431236.56426401
17 × 1553
-1715538.159e-97.920e-61.246e-5
19236713624196341323992791858.33094200004609
29 × 3248276021
2015-08-272932482760210.027713.92126.001
192367166987697524912881240892272.5041741142261980164
22 × 3 × 857 × 169305937571
2021-01-23857169305937571609.50725.601,355.2

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1923671368122945452288731487127008972994.894
192367168041866939607436734511808290872733109.068
1923671242776568283507551553773696483664613183140130.835
192367124659708521937921449617885896143727309289567760783
3
51167.399
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:02alpertronManual testing5000001500000012-
skipped known factor: 101573676143
--0.101--5.099%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-08-27T11:20:00TJAOIManual testing258259*58.330180.0080.2120.016


ECM factoring results:

Old Calculation Method

Total ECM effort:19.890 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.890 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
201100010.6280.002%
25500000.97837.601%
302500000.06293.981%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000495000040.277
500005000000342.362
50000660000021316.70
50000675000070.555


Lucas-Lehmer results:
No L-L results for M1923671


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:24:56alpertronManual testing
101573676143
362419634132399279
8907645C01882F__no
2017-10-20T07:19:12Oliver KruseGTX-1
101573676143
362419634132399279
8907645C01882F__no
2021-01-23T23:49:53mrhlanai
101573676143
362419634132399279
6698769752491288124089
1AED7470846751__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
259
230
240
250
260
270
280
290
2100
Last modified: 2022-02-10T10:47:34+00:00