is 2 16725883 - 1
has 5034993 decimal digits
takes 9.146 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDAD864926F14C58Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.776564.1791%21000053025000.38654.9115%2.163065.9384%1.7593%
PrimeNet2650.436263.0769%7000024000000.15624.4239%0.592364.7104%1.6334%
GPU722697.137865.2174%12000032000000.22823.2877%7.366066.3609%1.1435%
Difference-2-5.3613-1.0383%+90000+2102500+0.1583+1.6238%-5.2030-0.4225%-0.4225%

Known prime factors (1 factor, 84.4 bits, 0.00050441% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16725883249381457221898251064910332684.367745495640564681252
22 × 186373910141170313
2017-05-304186373910141170313238,9048.051e+91.504e+10

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-04-03T00:00:00MikeBumv4_computers2100005302500---0.386--4.911%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-07T00:00:00ANONYMOUSv4_computers21256--0.001--
2000-12-14T00:00:00ANONYMOUSv4_computers21256--0.001--
2001-07-07T00:00:00subgeniusv4_computers21265--0.436--
2016-03-15T14:50:46Mark RoseManual testing265266--0.447--
2014-09-16T13:08:00NesowaManual testing266267--0.894--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-04-19T00:00:00MikeBumv4_computersDAD864926F14C58D9.146
2006-03-28T00:00:00ANONYMOUSv4_computersDAD864926F14C58D9.146


PRP results:
No PRP results for M16725883


P-1 factor-bounds graph:
B1 = 210000, B2 = 5302500 (P-1 stage 2)
B1 = 210000 (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
1015
1016
1017
1018
TF factor-bounds graph:
267
266
265
256
250
260
270
280
290
2100
Last modified: 2017-05-30T19:10:51+00:00