is 2 1873367 - 1
has 563940 decimal digits
takes 0.102 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
Actual26715.861268.6567%500000150000000.10155.0829%15.962770.2499%1.5931%
PrimeNet2570.010263.1579%90001600000.00143.0301%0.011664.2743%1.1164%
GPU722610.164065.5738%100001500000.00141.6902%0.165466.1557%0.5819%
Difference+6+15.6973+3.0829%+490000+14850000+0.1001+3.3927%+15.7974+4.0942%+4.0942%

Known prime factors (3 factors, 151.5 bits, 0.00808777% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
187336710757809997511339.969287125
53 × 2297
-12522974.489e-81.914e-52.001e-5
187336720013891540471340.864534169
37 × 14437
2008-07-1537144371.267e-76.463e-50.0001
187336718928145014370162368972270.681505190520980944
24 × 31574407561309
2019-11-091631574407561309245.36135,320252,740

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
187336721530564250314898076422972580.833
1873367203625387669910395348747451401264734110.650
1873367378825841379892399221509017827215934111.545
1873367407533642371174390623320985301024402678923240946151.514
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:38:26alpertronManual testing5000001500000012-
skipped known factor: 1075780999751
skipped known factor: 2001389154047
--0.101--5.083%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:47:00J FeitsmaManual testing??40.864134.85545e-80.2171.03637e-7


ECM factoring results:

Old Calculation Method

Total ECM effort:19.830 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.830 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8140.015%
25500000.79944.988%
302500000.04995.179%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000352.424
50000500000020.139
50000660000021416.71
50000675000070.553


Lucas-Lehmer results:
No L-L results for M1873367


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T11:55:45Oliver KruseGTX-2
1075780999751
2001389154047
CA6868C23B4A95__no
2017-11-07T21:02:03Chang Chia-Tcheexbpc13
1075780999751
2001389154047
CA6868C23B4A95__no
2019-11-12T03:00:39fre_gamesgpu
1075780999751
2001389154047
1892814501437016236897
07C3EE36A45ABD17no
2019-11-12T03:07:46ATHec2-PRPCFDC
1075780999751
2001389154047
1892814501437016236897
07C3EE36A45ABD17no


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
1013
1014
TF factor-bounds graph:
267
2
230
240
250
260
270
280
290
2100
Last modified: 2021-11-19T10:18:02+00:00