is 2 1652909 - 1
has 497576 decimal digits
takes 0.078 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB8F456D87ED0EAAAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.976768.6567%500000150000000.08805.0068%18.064870.2260%1.5693%
PrimeNet2570.011663.1579%70001200000.00092.5643%0.012564.1026%0.9448%
GPU722610.185865.5738%7000700000.00071.1515%0.186665.9702%0.3964%
Difference+6+17.7909+3.0829%+493000+14930000+0.0873+3.8552%+17.8782+4.2558%+4.2558%

Known prime factors (1 factor, 63.5 bits, 0.00384050% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1652909128644712083401254712063.4803891463839915
3 × 5 × 83 × 3125673767
2010-05-148331256737671.509311.62121.705

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:17:55alpertronManual testing5000001500000012---0.088--5.007%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1997-12-04T00:00:00ANONYMOUSv4_computers21256--0.006--
1997-12-21T00:00:00ANONYMOUSv4_computers21256--0.006--
1998-02-01T00:00:00ANONYMOUSv4_computers21256--0.006--
1998-11-07T00:00:00Jo Yeong Ukv4_computers21257--0.012--
2003-05-11T00:00:00ANONYMOUSv4_computers21258--0.023--
2022-03-08T20:45:51LordJuliusManual testing258260--0.070--
2022-03-09T02:40:38LordJuliusManual testing21260--0.093--
2010-04-28T22:20:00Architects Cubedm1_tt260261--0.093--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.698 GHz-days
Estimated T-Level:24.429
DigitsB1CurvesCompleteFacMiss
2011000248 / 1002.4808.270%
2550000248 / 2800.88641.177%

New Calculation Method

Total ECM effort:14.698 GHz-days
Estimated T-Level:24.429
DigitsB1CompleteFacMiss
20110009.5380.007%
25500000.88341.372%
302500000.05694.585%
3510000000.00399.740%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024814.70


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-12-04T00:00:00ANONYMOUSv4_computersB8F456D87ED0EAAA0.078
1997-12-21T00:00:00ANONYMOUSv4_computersB8F456D87ED0EAAA0.078
1998-02-01T00:00:00ANONYMOUSv4_computersB8F456D87ED0EAAA0.078
1999-01-02T00:00:00Jo Yeong Ukv4_computersB8F456D87ED0EAAA0.078


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T19:10:54Oliver KruseGTX-2
12864471208340125471
471176AD24F6E7__no
2017-11-02T08:58:50kkmrkkblmbrbkc4.xlarge
12864471208340125471
471176AD24F6E7__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
TF factor-bounds graph:
267
261
260
258
257
256
250
260
270
280
290
2100
Last modified: 2022-03-09T02:40:38+00:00