is 2 1916833 - 1
has 577025 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9083F7C6FE6A48A3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.501668.6567 %1000000300000000.20296.2239 %15.704570.6075 %
Target2610.160365.5738 %100008500000.00441.7610 %0.164666.1800 %
Difference+6+15.3413+3.0829 %+990000+29150000+0.1986+4.4630%+15.5399+4.4275 %

Known prime factors (2 factors, 142.8 bits, 0.00745079% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
191683315257722735763732963992270.370397993010756903
59 × 118543 × 56904619
2013-11-2811854356904619125.280.25270.4555
191683364474297002545350574092272.4491681792232357888
215 × 7 × 7332032263
2022-01-11327687332032263577.5431.42658.690

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-08-26kurlyhex10000003000000012--0.20310.444%
2016-03-17alpertronManual testing5000001500000012---8.909%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-01ANONYMOUSv4_computers212580.020
2009-06-01Architects Cubedi4l_12602610.080
2011-07-17GrunwalderGIMPManual testing212630.832


ECM factoring results:
Total ECM effort:21.438 GHz-days
Estimated T-Level:24.994
DigitsB1CompleteFacMiss
201100010.6000.002%
25500000.99936.829%
302500000.06493.839%
3510000000.00399.701%


ECM Summary

B1B2factorcurvesGHz-days
10.208
5000050000140.586
500005000000332.184
50000500000010.069
50000665000070.550
50000750000021417.84


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02ANONYMOUSv4_computers9083F7C6FE6A48A30.104


PRP results:
dateuseridcompidcofactorsres64
2017-09-30alpertronManual testing
1525772273576373296399
2EA7877A6883831D
2017-10-20Oliver KruseThreadripper-PC
1525772273576373296399
2EA7877A6883831D
2022-01-11SRJ2877LTOS
1525772273576373296399
6447429700254535057409
C8E189E196EACC37
2022-01-11LordJuliusWhitebox
1525772273576373296399
6447429700254535057409
C8E189E196EACC37


CERT results:
dateuseridcompid
2022-01-11Simon Josefssonryza
2022-01-11Ember_EdisonMainServer


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
263
261
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=24.99 ~= 66-bit
250
260
270
280
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00